A member can’t book

Work down this list — it’s roughly ordered by frequency.

Symptom	Cause	Fix
Class shows but no book button	Booking window hasn’t opened	They wait, or you widen booking opens on that class
Book button disappeared near class time	Booking window closed	Check them in as a walk-in
“Class is full” and no waitlist option	Waitlist not enabled on that class type	Enable Allow waitlist on the class type
Blocked with a limit message	They’ve hit their plan’s weekly class cap	Upgrade the plan, wait for the week to roll, or book them in yourself — staff bookings bypass the cap
The class isn’t visible at all	Their plan is scoped to specific class types	Check Class access on their plan
Prompted to sign something	Unsigned required document	They sign; booking works immediately
Limited access everywhere	No active subscription	Check their status and payment — see Billing problems
Punch-pass member blocked	Out of punches	Sell another pass or convert them to recurring

Fastest diagnosis

Open their member record and check, in order: status, subscription, unsigned documents, weekly usage. One of those four explains almost every case.