![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(92.8, 90%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EC%3C/text%3E%3C/svg%3E)
Microsoft Teams
A Microsoft customizable chat-based workspace.
10,553 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(192, 40%, 28%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EWW%3C/text%3E%3C/svg%3E)
Possible Reasons for the Issue
Registry Key Issues:
- The logs indicate missing or inaccessible registry keys for Teams:
- `HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\AcquireSource` not found. - `HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Teams` does not exist. This could indicate that Teams wasn't properly installed or the registry keys were removed. **Permissions Problem**: - Lack of proper permissions to modify registry keys or system files might block the installation or update process. **Compatibility Issues**: - Although Teams supports Windows Server, certain configurations may cause compatibility issues, particularly with Windows Server 2022. **Corrupt Installation Files**: - The logs show that Teams is trying to fetch installation files from Microsoft URLs. If these files are corrupt or not downloading properly, the installation will fail. **Network Issues**: - If your server cannot reach Microsoft's endpoints (due to firewall or proxy restrictions), the installer might fail to fetch required resources. **Blocked by Security Policies**: - Some Group Policy or third-party software (e.g., antivirus, endpoint security tools) might block the installation process. **Squirrel Updater Issues**: - The error originates from the Squirrel updater, which is responsible for packaging, updating, and installing desktop apps. If Squirrel has problems writing files or accessing resources, the process will fail.
Potential Solutions
- Repair Registry Keys
- Check and restore the missing registry keys manually:
- Open
regeditand navigate to the paths mentioned in the logs.- If they are missing, create the following:
-
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Teams- `HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\AcquireSource` 1. Ensure the current user and SYSTEM account have the necessary permissions.
-
- If they are missing, create the following:
- Open
- Run the Installer as Administrator
- Ensure that the installer (
MSTeamsSetup.exe) is run with elevated privileges:- Right-click the installer and choose Run as Administrator.
- This resolves permission-related issues.
- Right-click the installer and choose Run as Administrator.
- Check Network Access
- Verify that your server can access the following endpoints:
-
https://teams.microsoft.com/desktopclient/installer/windows/-
https://aka.ms/maglev-x64-
https://aka.ms/maglev-x86 - Temporarily disable firewalls or proxies to test connectivity.
-
-
-
- Reset Teams Installation
- Fully uninstall Teams and delete residual files:
- Uninstall Teams from Control Panel > Programs.
- Delete residual Teams folders:
-
%AppData%\Microsoft\Teams- `%LocalAppData%\Microsoft\Teams` - `%ProgramData%\Microsoft\Teams` 1. Reinstall Teams with a fresh installer from the Microsoft website.
-
- Delete residual Teams folders:
- Uninstall Teams from Control Panel > Programs.
- Update Windows Server
- Ensure Windows Server 2022 is up to date:
- Go to Settings > Update & Security > Windows Update.
- Install all available updates.
- Go to Settings > Update & Security > Windows Update.
- Modify Group Policies
- If your organization enforces policies that block installations:
- Open the Group Policy Editor (
gpedit.msc).- Navigate to Computer Configuration > Administrative Templates > Windows Components > Microsoft Teams.
- Modify or disable policies blocking Teams installation.
- Navigate to Computer Configuration > Administrative Templates > Windows Components > Microsoft Teams.
- Open the Group Policy Editor (
- Check for Squirrel-Specific Issues
- Clear any existing Squirrel logs to ensure a clean start:
- Delete logs from
%LocalAppData%\SquirrelTemp. - Re-run the installation.
- Delete logs from
- Use Offline Installer
- Download the full offline installer for Teams (not the bootstrapper):
- Visit the official Microsoft Teams download page.
- Select the appropriate offline version.
- Visit the official Microsoft Teams download page.
Check System Logs for Details
- Event Viewer Logs
- Open Event Viewer:
- Navigate to Windows Logs > Application and System.
- Look for errors related to
Teams,MSTeamsSetup.exe, orSquirrel.
- Pay attention to error codes or warnings that can provide additional insights.
- Look for errors related to
- Navigate to Windows Logs > Application and System.
- Installation Logs
- Check
%LocalAppData%\SquirrelTempfor detailed installation logs.
- OneDrive Sync Logs
- If Teams is part of OneDrive deployment, verify the OneDrive sync status Possible Reasons for the Issue
- Registry Key Issues:
- The logs indicate missing or inaccessible registry keys for Teams:
-
HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\AcquireSourcenot found. -
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Teamsdoes not exist.
- Permissions Problem:
- Lack of proper permissions to modify registry keys or system files might block the installation or update process.
- Compatibility Issues:
- Although Teams supports Windows Server, certain configurations may cause compatibility issues, particularly with Windows Server 2022.
- Corrupt Installation Files:
- The logs show that Teams is trying to fetch installation files from Microsoft URLs. If these files are corrupt or not downloading properly, the installation will fail.
- Network Issues:
- If your server cannot reach Microsoft's endpoints (due to firewall or proxy restrictions), the installer might fail to fetch required resources.
- Blocked by Security Policies:
- Some Group Policy or third-party software (e.g., antivirus, endpoint security tools) might block the installation process.
- Squirrel Updater Issues:
- The error originates from the Squirrel updater, which is responsible for packaging, updating, and installing desktop apps. If Squirrel has problems writing files or accessing resources, the process will fail.
- Check and restore the missing registry keys manually:
- Open
regeditand navigate to the paths mentioned in the logs. - If they are missing, create the following:
-
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Teams -
HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\AcquireSource
-
- Ensure the current user and SYSTEM account have the necessary permissions.
- Open
- Ensure that the installer (
MSTeamsSetup.exe) is run with elevated privileges:- Right-click the installer and choose Run as Administrator.
- This resolves permission-related issues.
- Verify that your server can access the following endpoints:
-
https://teams.microsoft.com/desktopclient/installer/windows/ -
https://aka.ms/maglev-x64 -
https://aka.ms/maglev-x86
-
- Temporarily disable firewalls or proxies to test connectivity.
- Fully uninstall Teams and delete residual files:
- Uninstall Teams from Control Panel > Programs.
- Delete residual Teams folders:
-
%AppData%\Microsoft\Teams -
%LocalAppData%\Microsoft\Teams -
%ProgramData%\Microsoft\Teams
-
- Reinstall Teams with a fresh installer from the Microsoft website.
- Ensure Windows Server 2022 is up to date:
- Go to Settings > Update & Security > Windows Update.
- Install all available updates.
- If your organization enforces policies that block installations:
- Open the Group Policy Editor (
gpedit.msc). - Navigate to Computer Configuration > Administrative Templates > Windows Components > Microsoft Teams.
- Modify or disable policies blocking Teams installation.
- Open the Group Policy Editor (
- Clear any existing Squirrel logs to ensure a clean start:
- Delete logs from
%LocalAppData%\SquirrelTemp.
- Delete logs from
- Re-run the installation.
- Download the full offline installer for Teams (not the bootstrapper):
- Visit the official Microsoft Teams download page.
- Select the appropriate offline version.
- Open Event Viewer:
- Navigate to Windows Logs > Application and System.
- Look for errors related to
Teams,MSTeamsSetup.exe, orSquirrel.
- Pay attention to error codes or warnings that can provide additional insights.
- Check
%LocalAppData%\SquirrelTempfor detailed installation logs.
- If Teams is part of OneDrive deployment, verify the OneDrive sync status
- Registry Key Issues:
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(172.8, 5%, 26%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERS%3C/text%3E%3C/svg%3E)