Cannot set/update auth_mode

[hmarth]

The scenario SCENARIO_EDIT_ADMIN in the User model does not allow to set (on user creation) or update the field auth_mode.
Therefore it is not possible to set auth_mode via the API.

$scenarios[self::SCENARIO_EDIT_ADMIN] = ['username', 'email', 'status', 'visibility', 'language', 'tagsField'];

Possible solution: set auth_mode like authclient_id in ApiUser load function:

$this->user->authclient_id = $this->authclient_id;
$this->user->auth_mode = $data['auth_mode'];