Can't switch accounts/characters

I have 2 Starcraft 2 accounts/characters. I opened a ticket because I am unable to login to my main Starcraft 2 account after the patch on 5/7/2020. Since the latest patch, I am only able to log on to my 2nd account. I have followed the FAQs and submitted a ticket and was told to post here for help.

I am able to see the dropdown to select accounts, but both options load the same account when the game launches.