Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Have you tried removing the authentication part in the options?
If you don't force users to authenticate, you/they can open an incognito tab in the browser. It will ask you who you are and you can vote for them.
It doesn't work for me because as I said, when my polls are broken they are completely f.up. but I've read in multiple forums that the incognito workaround works for many people.
Just an idea.