Receiving outlook emails on another account using POP

So for years i've checked my outlook emails (an old msn.com account) using my gmail account via POP3. To authenticate i simply used my email and password, but this stopped working since 25th of September as the outlook server refuses the authentication. Checking in the support pages about pop and imap, i can read that now OnAuth2 is required to authenticate. The only thing i can find on how use this new authentication method is this one: https://learn.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth#register-your-application
If i'm reading this correctly, this means that i need to have an azure account and i should create an acess token to use on my gmail acocunt. My questions are:

1. Is there another way to do what has been so easy in the past years?

2. Is this one of the always free services of azure?

3. do i need to do the same if i would use thunderbird as a client?