UNABLE TO SIGN IN ON ATT.COM
Hi team, I have the same problem.
Each time when I try to login I get "Oops! Something went wrong. Try clearing browser cookies and try again."
I found a lot of questions on your portal like this one https://forums.att.com/t5/Online-Account-Access/UNABLE-TO-SIGN-IN-ON-ATT-COM/td-p/5167249 but did not find a solution.
1. I can login only from my phone (Android).
2. I'm in NJ and connected to AT&T in NJ.
3. Tried from several PCs/laptops
4. Tried in incognito mode.