passphrase needs to be reentered for every relogin

[tdkuehnel]

I don't know if and how this issue is related to the rest_auth_provider, but after authenticating users on a clean, separated synapse install with a fresh database against a postgres db via a django rest api call, everything works as expected, except every user has to re-enter the passphrase after logging out and trying to re-login.

My guess is the device tokens or whatever are not considered correctly, but every advice into the right direction is welcomed.