I don’t suppose anyone has any idea how long “eventually” is for iOS to receive the certificate and prompt for a password? Both devices have synced many many times. Everything looks perfect on the Linux client, but iOS has one new note added which is Encrypted. All the remaining notes are still on the device unencrypted, and the iOS client says encryption is disabled.
Well I’ll be… I turned the Encryption OFF and when I opened Joplin this morning on my phone, it prompted for the password. It took nearly 24 hours. So on my Linux client I turned it back ON, but it generated a NEW key. Here we go again, but at least I know what to expect now.