Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Two "good" fixes. First, if you can see the prompt when you are asked for privacy selection, make sure you can see the entire screen. If you cannot, change your resolution temporarily so you can. If that doesn't fix the problem, make sure you sign out of any/all of your Microsoft accounts. Sign in to each account one at a time and complete the privacy prompts. If you have any Microsoft app open on any other device, you need to close all before you can start to clear one account, then another. Check all your devices - phone, iPad, etc. to make sure you are signed out of any Microsoft account on all of the devices. Then when you open one, you can click through the prompts. Also, depending on your sync settings, you might have to do the same process on all of your devices.