SSO gives AADSTS50011 error: The redirect uri specified does not match the URIs configured. http/https

[vankampen]

Microsoft 365 is configured, and I have reconfigured it just to make sure. The Microsoft button is available, but I am getting this error. The redirect uri is not with https, but with http, so it does not match the configured redirect URI (the same as shown, but with https). Is there a configuration that I am missing?

 

[Charles_3CX]

Try accessing the management console to configure the integration using the https://yourhostname.3cx.nl:5001, as the auth needs to be entered using https and not http.

 

[vankampen]

Thx, I am using pfsense with haproxy, and configured it to also enable https://yourhostname.my3xcl.nl:5001. There is no change.
The 365 integration is working, I am getting users from 365. Only the SSO is not working.

It has probably something to do with the Haproxy configuration, so if there is no obvious solution, please do not spent to much time on this. For the rest the whole system is working flawlessly.