An applicant account can have at most one active Priority Review subscription at a time. If you try to sign up for a second one while an active subscription exists, the signup form will redirect you to /applicant/subscription instead.
If you have a cancelled subscription on file, you can resubscribe — but at the current platform price, not your previous locked price.
Something not right with a charge?
Send a change request: billing mistakes our records prove are refunded automatically, and a person answers the rest within two business days.