Ask to buy requests stopped coming through

I'll start with an undocumented possible solution mentioned by several people where editing the name of a device worked for them:

Settings > General > About > Name

Then "Done" and retry.

Otherwise If Ask to Buy isn't working, read the suggestions in the document: If Ask to Buy isn't working - Apple Support about looking for the request in Messages or Notification Center.

Make sure notifications haven't been disabled. This article discusses notifications: Use notifications on your iPhone or iPad - Apple Support

and this one Change notification settings on iPhone - Apple Support

Make sure the software is up to date on all devices involved.

Sometimes it helps to have the devices involved take a fresh look at settings:

● Try signing out of accounts and back in again.

Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support

Sign in with your Apple ID - Apple Support

● Restarting is a simple step that can resolve many unexpected behaviors.

iPhone: Restart your iPhone - Apple Support then choose your model.

iPad: Restart your iPad - Apple Support

Mac: Ways to start up your Mac - Apple Support

If a problem persists, particularly over several days, try contacting Apple for assistance:

Click here --> Choose your country or region - Official Apple Support Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

"See a list of Apple phone numbers around the world."

Click here --> Contact Apple for support and service - Apple Support

After a ton of frustration for the last two weeks, I finally found this page and Limnos post. Thank the gods, and Limnos, and google for finding this post in the sea of complaints on this issue and related.

So,

Settings > General > About > Name

Change name

Then "Done" and retry.

worked for me.

Previously, the default name was 'iPhone'. I changed it to something more unique.

After I changed the name, notifications resumed for ask-to-buy. The only thing I can think of that triggered it to no longer work was that I added a new device and member to family sharing, my daughters ipad, after xmas.

So, this is a work around, but there is clearly an underlying bug that needs addressing.

Did you already try to force restart your iPhone?

Force restart iPhone - Apple Support

Did you already try the suggestions in this discussion?

Ask to Buy not working. - Apple Community