WSOD after changing Authentication keys and salts in wp-config.php

Hello from Norway!

This is my site arnaclinic.no

Due to security procedures, the hosting provider of has pulled my employers site offline until we change/update all passwords for the db and the wp login.
I change the db password, alls fine.

When I change the Authentication keys and salts in wp-config.php, I can see the /wp-login.php page but it naturally doesn’t accept my current password as expected, BUT when i request a password change and follow the link via my email, I get the WSOD :O !!!

Please help!

I have tried renaming the plugins folder and clearing all cookies, but no change. 🙁
I have read other threads about this but I cant seem to find one that has the same problem.

Thank you verrry much for your assistance!