Couldn't delete your account. Try again.
If you're the only Admin of a Switchboard, invite another Admin or delete that Switchboard first - every Switchboard always keeps at least one Admin. The message on screen names the Switchboard.
Read the Switchboard name in the error message.
Invite another person to that Switchboard as an Admin, and wait for them to accept.
Or delete that Switchboard from Settings > Switchboard > General.
Try deleting your account again.
Still stuck? Send AVX-3093 to hello@theavoxai.com along with what you were doing when it happened.