Hi, That may have been brief outage of the Apple Pay system. But a quick check of Apple Services, https://www.apple.com/support/systemstatus/ doesn’t show any current or recent outage. Have you tried again?
Here is brief list of items that may cause issues in accepting an invite.
possible issues,
- all iPhones must be iOS 14.6 or higher
- turn off VPN
- log out and in to your Apple ID
- ask Participants and/or Co-owner to log out and into their Apple ID
- make sure you and participants are currently in US.
- make sure Participants and Co-owner has Apple Cash setup in Wallet App
- Family Group members should update their age in Apple ID. >> https://support.apple.com/en-us/HT204164
- Participant must be using same Apple ID they use for Family Sharing Group
- Two factor authentication must be turned on
- Restart iPhone after performing any of the above
It may be necessary to delete the invite and their reinvite to share the Apple Card. It can be as simple as just logging out and back in to your Apple ID or enabling 2 factor authentication.
I hope this helps.