SSO & SAML Authentication app not found

Reinstalled my Linux server today with fresh nextcloud-11.0.1 install.
SSO & SAML Authentication app can be seen in admin menu, but clicking on it returns 404:

Object not found! Error 404

URL: https://SOMESERVER/cloud/index.php/settings/admin/saml

Please advise, how to make this app available and working back.

PS: It worked without any problems on previous installation (6 months ago) :frowning: