Blaboo Parental App + QR-Scan ask Google account/ microG

I try to use the blabloo parental app. It asks me to scan a QR code. But instead of scanning I get a message:
“microG Service Core: An app tried to log in on an Google Account” and gives me only the possibilities to log in or to go back.
I use fairphone3+ with “e” as OS
Shouldn’t microG provide the same functions as the google libraries? Is that a problem the blabloo app causes?