Webmail demands passphrase?

I just got a new /e/OS phone and set up the murena.io mail address. It works fine on my phone but when I try logging in on the workspace webmail it demands a passphrase. My normal account password isn’t working and I’ve not set up any passphrase. The exact error I get is:

Request timed out

Server message: Login

What is this and now can I get into my account?