ummm b/c i just got trapped here as well…
here’s what i did.
to be able to enter your admin-standard password you need to either enter the following link directly into your browser (after logging in to NC, of course) https://yourdomain.tld/index.php/apps/rainloop/app/?admin
or you go to your admin-account in NC click settings (upper right corner) and then go down to “additional settings”, find “RainLoop Webmail”-Section and click “GoTo RainLoop Webmail admin Panel”…
you can access adminpanel/enter the standards only using these.