“Unlimited puzzles” promised with Gold Membership.
If you had premium before September 1st, 2022, you had the old plan and pricing that did not include unlimited puzzles. Members with the old plans kept their original features and pricing.
https://support.chess.com/article/4566-september-1st-plan-changes
If you would like to upgrade to the new plan and pricing, support can assist:
https://support.chess.com/article/346-contact-us