On: Lithuanian university locks out students again for...

[kensai]

I know it will be an unpopular answer, but given there are two options (namely: Microsoft Authenticator or using the SMS option) what is the problem? If the SMS option is such an attack to your privacy, use a cheapo phone with a prepaid SIM registered to your dog. Not all countries permit this, but it's a start.

[shjake → kensai]

> registered to your dog. Not all countries permit this

In Lithuania you don’t even need to register anything. You can just buy a bag full of sim cards in any supermarket completely anonymously.