NC12, Adding user not possible

[michaelletzgus]

Stable 12.0.0.29 (upgrade from 11.3 via upgrade app), trying to add an user.

1. js-console:
   TypeError: result.responseJSON is undefined[Weitere Informationen] users.js:1050:7

2. network-console, xhr request:
   https:///settings/users/users results in 403 forbidden
   HTTP response contains the "Zugriff verboten, CSRF check failed" page

Update: The request header does not contain the nc_samesitecookie options, only the __HOST-prefixed ones. Current master does send the unprefixed nc_samesitecookie options and user adding works.

3. server error log: nothing

4. server acces log:
   only https:///settings/users/users

Findings so far:

• Problem is initially "caused" by by password policy app
• User can't see this because the error message does never reach the screen
  => Adding users is working correctly
  => password policy app might work correct, too (problem with error messages)
  => Message is not forwarded properly in UsersControler.php, catch, Line 404

[LukasReschke]

I guess you use Nginx, please check nextcloud/documentation#392 and make sure to always keep your Nginx config up-to-date or use a Apache, our recommended web server, where we actually can control such things via .htaccess.

[michaelletzgus]

Thanks for the hint - this resolves the missing message.
Now I have message like

Fehler beim Anlegen des Benutzers: {message}