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I also though the Mi Pad 4 was a good tablet for my Kid so I bought one for his birthday, but after initial setting up Google Services I found out Family link is not able to finish the setup process and I can't control the device on family Link :( unlike an old Nexus 5 he also uses)
Now I'm in the waiting period of 720hours (one month !?) to unlock boot loader in order to install Mi Pad 4 EU Rom just to test if it's playing nice with family link... All this hassle wouldn't be needed if family link was working fine in first place.
Yep, I get to that same state and I also tried to go to settings and add permissions to all Google services/apps/family-link related, as well as device admin, but still can't get past that message "Now you'll activate Family Link manager..." with the "got-it" button.
That's good news, if you say xiaomi.eu ROM does play nice with family link, at least there is a workaround for this problem. Now I'm stuck waiting for xiaomi permission to unlock my bootloader in order to fix this problem, lets hope the ROM is not very unstable.
PS: I'm new to xiaomi ROMs and I find it strange that the version number in xiaomi.eu ROM's (8.x) is lower than the official Chinese ROM (9.x).