Ask to buy

I have Ask to buy activated on family sharing. Up until recently if my children request an app on their apple device, the request would come through both my personal & work iphone as well as my iPad.

The notification is now only coming through one iphone and not all devices and when I select the notification to go through to approval process it Takes me no further than a white screen. Just hangs thinking and the only selection available while it's thinking is Cancel.

Nothing has been changed in my setting on any of my devices. I have restarted my phones, turn on/off the requests function, checked my password etc and nothing is working.