Docker installation - SSO & SAML authentication outputs metadata as http and not as https

Hi there,

I installed nextcloud whith docker and the jwilder nginx proxy. Activated/installed the SSO & SAML authentication and all the necessary certificates.

I can login with my shibboleth authentication credentials, however, after the login I get the message: “This form will be sent in a way that is not secure. Are you sure you want to send it?”.

If I click on “send”, everything works fine: I am logged in with my shibboleth account. However, I wonder what is going wrong.

I have noticed that the entityID, when downloading the metadata.xml, begins with http and not with https. Can someone help me with this issue?
nextcloud-sso-problem01

nextcloud-sso-problem03

(picture 3 since I was allowed to insert only 2 in my first post)