Not to be a thread Necro'er but this issue is still on-going.
I got a new machine that had Win 10 on it. Affinity programs were installed fine. Had to do reformat the hard drive/re-install windows, so I installed Win11. Now I can't register the product.
I did try the "Install Beta" trick posted on the first page. I installed all current beta's, opened the programs, opened the regular versions and tried to "Sign In" and I'm still greeted with the timeout error. Trying to log in on the beta's also generates the same error.
Windows 11
Chrome
Just default Windows system firewalls
Downloaded/Installed from my Affinity account, not the Microsoft store.
Edit: Potential Solution
I ended up having to run each Affinity program as Administrator and then it would load properly without the timeout error.
Loading the program normally = timeout when trying to sign-in.
Loading the program with "Run As Administrator" = no timeout issue, able to proceed with login.
I tried opening and closing the apps several times to confirm it wasn't a fluke. Whenever I wasn't using "Run As Administrator" the timeout error appeared.