I discover this message “Sorry, you are not allowed to access this page” mostly occur when various WordPress sites are in the same phpMyAdmin – all bearing the same table prefix, irrespective of the database name. I can’t tell how many WordPress sites are expected to be in the same phpMyAdmin with the same table prefix.
Its resolved here https://www.naijatechzone.com/wp-admin-login-error-sorry-you-are-not-allowed-to-access-this-page/
