Unable to start program 'c:\Program Files\Microsoft Office\root\Office16\outlook.exe' VSTO Add-In
I'm creating an Outlook Add-In using VSTO in VS2022 and I'm getting this error: "Unable to start program 'c:\Program Files\Microsoft Office\root\Office16\outlook.exe'. The process has been terminated. Refresh the process list before attempting another attach", This happens even on a brand new empty VSTO Outlook Add-In project.
My Outlook desktop is Version 2409 Build 16.0.18025.20030 64-bit, running on Windows 11 24H2.
I tried these suggestions from Copilot:
Check Outlook Installation: It is the same path shown on the error.
Run Visual Studio as Administrator: Didn't help
Repair Office Installation: Didn't help
Check for Conflicting Add-Ins: all other add-ins disabled, same error
Update Visual Studio and Office: Up to date
Debugging Options: It stops before getting to debugger
I can't find a similar question in the usual suspects, StackOverflow, Microsoft Learn, etc. Any help on where to look?