question

I have seen this sort of thing when logged into prod and sandbox. Clear out your browser cache and make sure you are logged out from other envs or try incognito

Didn't work. This is all I get indefinitely.

I reset my password on the sandbox login page and was able to get in. I think the problem may have been that I did not recognize the distinction between global and developer when I first signed up and I likely used the same password for both. It seems that links from global to sandbox crash when 2 factor is active in sandbox???

Sometimes, login issues can arise from the sandbox environment itself. Check if there are any known outages or maintenance updates on the platform’s status page or forums slice master.