Can you make the phone number mandatory for the sms text reminders?

Hi ​@Fionn42252 - At this time, you cannot make the SMS Reminder field mandatory. This field is required to be opt-in since The Telephone Consumer Protection Act (TCPA) wouldn’t allow for it. The TCPA rules around when you can text someone, what content you can text them.

Its something we’re still looking into and may change in the future. But at this time, this is required to allow the invitee to opt-in to receiving texts.