Your license is bound to the domain it was activated on. That is what makes it secure and re-assignable. After a migration (new domain, or www/https change in your Site URL), the stored token no longer matches.
The same applies to staging copies: connect the license on the domain where you want paid features active. Free-plan features work everywhere.
Everything above runs inside your own WordPress admin. From $39/year, with a 14-day refund policy.
See pricing →