Unable to rename Shiny account or select a name for a new Shiny account

I've been working in Shiny with no challenges--able to run locally and publish.

However, I need to change my Shiny account name so that the URL is changed accordingly. For some reason, when I go to the shiny dashboard (GUI) and select Account> Settings> Rename Account, I receive this error:

Request Validation Error: : field 'name': is invalid account name

The name I'm trying to choose is all lowercase, letters only. I tried a few other names that are unlikely to be selected and received the same error.

Does anyone know if there's a workaround, or if this is a known issue? Perhaps I can rename my account using rsconnect?

As background, I initially tried to create a new account using a different email address (this would be my preferred solution), but when I got to the Account Setup page where it asks me to select an account name, I get the same error.

Thank you!