Step 1: Log into the Owner's personal Facebook account. Typically the Owner is who originally created the Facebook page. If you are not the Owner, you will not be able to see the request. If you cannot access the Owner's account, the best next step is to contact Facebook Business Support.
Step 2: On the left-hand side menu, go to the Pages tab.
Step 3: On the left-hand side menu on the Pages page, select Meta Business Suite.
Step 4: Choose "Settings" at the bottom of the left-hand side menu in Meta Business Suite. If you do not see the Settings tab here, you are not in the Owner's account.
Step 5: You should see a Requests tab on the left-hand side menu. If you click the dropdown arrow, it should show 2 options under Requests: MBS Requests and Other Requests. Click on both tabs to check for a pending request from Promoboxx. If you see one, hit Approve. If you do not see one and believe you should, it is again likely you are not the Owner. You can contact Facebook Business Support if you need to get the page ownership transferred so that you can access the Request.