message: Allow edit username if we can't determine mutability.
diff: @@ -204,7 +204,11 @@ export const UserForm = ({
  id="kc-username"
  aria-label={t("username")}
  name="username"
  - isReadOnly={!!user?.id && !realm?.editUsernameAllowed}
  + isReadOnly={
  + !!user?.id &&
  + !realm?.editUsernameAllowed &&
  + realm?.editUsernameAllowed !== undefined
  + }
  />
  </FormGroup>
  )}
  