I don't know where you're located, but in my corner of the world, this is not unusual.
If you wish to push text messages, you will need to sign up with an SMS service provider. You can reserve a short, 4-digit number for your services, which is expensive.
Or you can reserve a keyword within a 4-digit number. The number is then shared among other services, ...
Microsoft claim to be prioritising Edge and Chrome due to "customer value". Blocking other browsers is one way to stop bug reports from an unsupported browser. Opera is Chromium based as well, so may not get picked up by the user-agent block.
In a statement to VentureBeat, a Microsoft spokesperson said the service requires “calling and real-time media” ...
The Microsoft Forms doesn't support the extensions through developer APIs. Features it doesn't support:
Microsoft Forms Preview doesn’t allow embedding images or videos,
themes, question branching, co-authoring of forms, and extensions
through developer APIs. Microsoft Forms Preview will evolve over time
and additional functionality will be added ...
You have to sign out
THEN go there
And there is a submit a bug button
Click that "submit a bug"
Then there is a sign in page. Sign in
Then you get a form to submit the bug