Issue with notifications in external network

I am having problems with seeing notifications from external network (Microsoft's network to be exact).

I can see the notification count all right:

However upon clicking the bell, I get this error 90% of the time:

What is really weird, is that every now & then it works just fine - it might take 10 times trying the bell icon, or 50, but those notifications will at some point be shown to me all right.

I seem to be in tiny minority of people having this issue.

Does anyone have any guidance or troubleshooting approach? Is this a setting in my home tenant, or Microsoft tenant? Account permissions?

Does a log or telemetry exist anywhere where I could start asking the right questions how to resolve this.

If anyone has any insight, that would be greatly appreciated

Thanks,
Maciej