Servicedesk Plus on Windows Server 2019, With MS SQL 2022 Database.

After upgrading to version build 14600, our users are no longer able to use the funktion 'Forgot password'

On the "have you forgot your password" page, the user is asked in enter domain/username in the field, insted of emailadress.

All users are local users, we don't use LDAP authentication.
When the user enter their email adress and press 'Send email', an errorbox with no info shows up.
The same happens if the user tries to user domain\username

Using network inspection I can see the error is "500 Internal server error"

Any idear what can have caused this?