Changing username equals Unknown Error

Hi all

I’m admin of the account and I’m trying to change the name of the Person [the admin] under Configuration.
When I change it from the original name to the desired name, it flags up “Unknown Error” at the top.

How do I fix this please?
Picture of issue below



Same Problem…

Same problem for me!

Have you found a solution so far?

Version 2020.12.7
Operating System Home Assistant OS 5.10