Support for logging in with Google account

I'm trying to launch Yazio on my new phone, and it's asking for a username and a password. I have no recollection in setting these. Google password manager (that I always use if it's available) doesn't autofill the username/password fields like it does for some apps, and even if I launch it (from the link on top of the virtual keyboard), it doesn't return anything for "yazio".

As most (all?) Android users have a Google account, I find it a no brainer to support Google authentication for logging in into a user account. Having to hunt for a password from a Password manager (that the app doesn't seem to integrate with nicely), or having to reset password on each reinstall, is an unnesessary chore.