Accept Access Request from LinkU
Normally a notification will be sent to your Facebook account asking for access to manage your business page. If you do not see the notification, you can try this.
Login to Facebook.
Go to Your Facebook Business Page where the Access Request was sent. Your Business Page can be found by searching or in the Drop Arrow in the very top right corner of Facebook.
Click on Settings in the top right bar.
On the left, find Page Roles.
On the Page Roles page, go to Agencies.
You should see a pending request here. Follow the instructions to accept the request.