Hi Thomas, welcome to the forum, hope you’re enjoying eOS!
I can’t help much but have you logged into google account in microg settings before installing the apps?
There are some articles somewhere on the forum regarding microg and what to expect from it. Some things that need google play services work on e, some things don’t unfortunately.
There is this list of apps that work and don’t work with microg but I couldn’t see any mention of the games.