Thank you for these questions!! In an example, my mom holds a piece of my key. She upgrades her iPhone. She signs into iCloud, Face ID works, she opens Seal an

Thank you for these questions!! In an example, my mom holds a piece of my key. She upgrades her iPhone. She signs into iCloud, Face ID works, she opens Seal and it knows exactly who she is. Everything looks normal. But her piece of my key is dead, because that piece was locked to the old phone. She has no reason to suspect anything is wrong, which is why I need to fix this in the app ASAP I think. She needs to Seal her Envelopes again with the new phone's key. She can also have a backup hardware key to restore the credential but she has to re-seal again as well in this scenario if she is logged out of her Apple account or broke her main hardware key.