Dynamics365 not accessing Sharepoint (on-prem) - Org wide issue - no changes to environments

Question

SCENARIO

• User tries to browse to SharePoint via Dynamics 365 document files tab.
• User gets Unauthorized error

IMPACT This prevents our business users from manually uploading files into SharePoint via Dynamics 365.

TROUBLESHOOTING SO FAR

• Check other farms -> DEV/UAT farm also experiencing error, so this is not isolated to one server or trust config 
• Check Power Automate/On-prem Gateway -> working as expected 
• Check user permissions in SharePoint sites -> permissions configured as expected
• Check app permissions in SharePoint (appprincipals scope=site) -> looks good 
• Check user profile service  -> no missing profiles
• Check email format (case sensitivity)  -> looks good
• Restart SharePoint WFE server  -> no positive effect 
• Check unbound IP whitelist -> whitelist is correct  (we verified against published list of Azure IP Ranges 
• Check SP Server ULS logs -> no obvious errors related to authenticated
• Check SP Server Event Log -> no auth errors 
• Test with a new AD account -> no positive effect, same 401 error   
• Test SharePoint integration in D365 -> configured as expected 
• Check Trust configuration (Powershell) -> looks good 

Answer 1

Hi @Daniel Marinos，

A recent update to Microsoft 365 authentication systems contained a code issue, resulting in impact to some Microsoft 365 apps and services. Currently there might be some users unable to authenticate to Microsoft 365 services. And some users may be unable to use features or access files which leverage Microsoft Purview Information Protection labels.Since this issue need to be checked from background, and our forum doesn't have access to the backend currently. The best way to troubleshoot the issue is to report the issue to M365 admin center Service Health.

The support team there has the correct escalation channel for this case. This is also the most efficient way in handling this kind of issue. You could report the issue by click

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