@twann My knowledge is limited here but as far as I know the problem is that MicroG can't answer SafetyNet requests correctly. This is not a general problem because about 2 years ago it worked fine but google changed something and since then it won't work anymore. https://github.com/microg/RemoteDroidGuard/issues/24

However, one person says that Banking Apps can work with Magisk... I will try it but one year ago I was not able to make all banking apps work...