The property JSON-LD schema from the AI Booking Channel does not include a telephone.
Why this happens. The telephone is left out of the schema when no phone number is on file. The AI Booking Channel never guesses a phone number.
How to add one. Enter the number in Rank Math → Titles & Meta → Local SEO under the Phone Number list, or type it directly in the Business phone field in the AI Booking Channel settings and save. Once a value is present, it appears in the schema, and the field caption confirms the source.