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YouTube is now flagging accounts on Premium family plans that aren't in the same household
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
That's the old way of handling it. (And I think it still works.) They have a new implementation that's just the family group admin sending an invite and the recipient accepting.
Which only works If you were in the same Network atleast for me
After I made my comment I saw someone else make a comment about getting a message saying that. I never did. Mine just worked. Weird.