I tested the following scenarios and made sure that [ENG-8101](https://linear.app/comm/issue/ENG-8101/authoritative-keyserver-admin-user-is-missing-from-userstore-after) was resolved (no "anonymous" username):
1. I tested account creation via keyserver auth in a multi-keyserver environment
2. I tested login via keyserver auth in a multi-keyserver environment
3. I tested legacy account creation in a legacy environment
4. I tested legacy SIWE account creation in a legacy environment
5. I tested legacy SIWE login in a legacy environment