When using MitID the support for using a password manager for having a “random” or “complex” User Id is not well supported. As a user you can indeed select the User Id from your favourite manager (here 1password but same with LastPass and the same in different browsers on different platforms), BUT: you cannot press continue after selecting the User Id. You have to as a user - as a workaround - delete the the last character and enter it again. After that you can continue as a user.
This is highly annoying. Can this be considered a bug?
