Can't login with User "usgmtr"

Hello

I'm trying to update my UM 3.3.0 installation to 3.4. I used the official user guide and followed every step as described.

Had nu issues to import the data from the old UM to the new one. But as soon as I want to login the web interface, the login fails with the user "usgmtr".

When I login into the console with the exact same username and password it works.

Any advice from you guys?

Regards,
Dominik