@Pavel yannara Mirochnitchenko Thanks for posting in our Q&A.
For the company portal app, did you deploy the online app? If yes, please try to get logs in Event View to find if there is any error message. We can refer to the following article:
https://learn.microsoft.com/en-us/windows/win32/appxpkg/troubleshooting#get-diagnostic-information
If there is anything update, feel free to let us know.
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