I recently deactivated my Instagram account for a few months and when I tried to log back in I couldn’t remember my password. So as you would, I submitted a password reset and then when I tried to log in using the new password but I got the following error:
The username you entered doesn’t belong to an account.
Tried another password reset but still got the same error!
Only after completing a password reset and then logging into the Instagram app on my iPhone did it reactivate the account.