How to fix child account issues on iPhone 12 Pro?

I did get this from a Reddit user

On Phone 2:

• Check for sign-in prompts in Settings, if present they'll be near the top (above Airplane mode and below the name). Often labeled "Apple Account Suggestions" or "Update Apple Account Settings". Any Terms & Conditions should also be acknowledged/agreed to
• Sign in to iMessage: Settings > Apps > Messages > Send & Receive > Use Your Apple Account for iMessage -- if you don't see this button, you will see their Apple Account email in small blue font
• Add your and your wife's Apple Account email to your respective Contact Card in Contacts: Contacts app (or Phone app > Contacts) > your contact > Edit > add the email and save
• Still in Contacts, make sure the top entry, My Card, is that child's information
• Remove any emojis and/or special characters from the device name: Settings > General > About > Name

Your device (and your wife's):

• Do all the same as above, adding your child's Apple Account email to their contact card on your and your wife's device.

Test Ask to Buy from iPhone 2. If the issue persists, sign that child out of Media & Purchases on iPhone 2: Settings > [name] > Media & Purchases > Sign Out > confirm -- restart iPhone (power off & back on) -- Sign back in by tapping on Media Purchases > Continue

Yes it has the original battery. It was in pristine condition before I gave it to my child. 85% max battery She is saying now that the only app she can't download is google. I am wondering why the notify to download or buy is going not to text message me.