User cannot access the Accounting modules even after purchasing that subscription.
This happens because the Accounting package was purchased, but not assigned to the user. Core offers various subscription packages and each user is associated with a package based on the role in the company. The account owner can add new subscription packages to Core. Right after you purchase the subscriptions, Core checks if the logged account is missing any of the purchased subscriptions. If any of the packages are missing, Core prompts you to assign subscriptions automatically to your account. If you prefer, you can do so manually from the Manage Users screen. Check the Core Help for details.