Hello @Yurko ,
Is there any screenshot for the issue?
Can you show your registry settings of Profile Container and Office Container?
Is there any settings in the Office Container that conflict with Office add-in registry value?
Will the issue be reproduced if you don't add the Office add-in registry value but still enable Office Container?
For your reference:
https://learn.microsoft.com/en-us/office/dev/add-ins/testing/testing-and-troubleshooting
https://learn.microsoft.com/en-us/fslogix/configure-office-container-tutorial
https://learn.microsoft.com/en-us/fslogix/profile-container-office-container-cncpt
Best regards,
Leila
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