Wonder if anyone can save my sanity.

Child's phone is dying, I got a pixel 6 and flashed #LineageOS on it, plus MindTheGApps

Trying to set it up with Family Link and having many problems.

1) is this even possible (or do I need to use stock android)
2) Please point me to the guide / answer

(No, I don't need a lecture on phones for youth, google bad, etc.)