I cannot see your appointment in your relays, and it seems you are only using nostr.mom as a relay; since the calendar app uses your relays, if your single relay does not accept calendar events, it will not be possible to make an appointment. I tried to send you a DM, but it seems you do not have an inbox relay for DMs either; therefore, you can send me an email at [email protected] or just invite me to the call with my Google account, [email protected]. This surfaced a bug in my calendar app; I will add a clear warning that single relays can fail, and I will force the app to record to alternate relays as well.