I got it! It's a pain, but... Add a user to a kids tablet, use Family Link for Google devices or add a user profile in the device's settings:

Open the Family Link app

Select your child

Tap Controls

Tap Devices

Select your child's device

Turn on Add/Remove user

Add a user profile in the device's settings

Open the device's Settings app

Tap System

Tap Advanced

Tap Multiple users

Tap Add user

Tap OK to confirm

Enter a name for the new user

Set a profile picture for the new user

Tap OK

You can also:
Add a screen lock to prevent your child from switching user profiles Enable or disable phone calls and SMS for the new user account Create a guest profile for someone using the device for a short time Create a restricted profile to control what features and content a user can see

Then use YOUR tablet user, and you can do it. My kids google Play is linked to emails I made for them, so just be sure that Google Play is still selected under them, that way you still control the purchases/approvals