Apache2 proxy not working as expected

[echeloni2p]

Hello

I tried to setup a apache2 reverse proxy and use only port 443 (and let apache2 handle SSL/TLS).
But I cannot login into our onprem service.

I do run the docker-compose solution, it works in http://url:8080 and backend on http://url:8081

I tried this apache2 setup:
<Location /api>
#AllowMethods GET POST OPTIONS
ProxyPreserveHost On
ProxyPass http://localhost:8081/api
ProxyPassReverse http://localhost:8081/api

    <Location />
            ProxyPreserveHost On
            ProxyPass  http://localhost:8080/
            ProxyPassReverse  http://localhost:8080/
    </Location>

In docker-compose.yml I set

   - API_BASE_URL=https://dependdany.track.url.tld"

For the ReverseProxy and keep backend running on 8081:8080 and frontend on 8080:8080.
I get to login page, I may enter the user data and I get a 405 error in apache2.
And I got no idea whats wrong.

any ideas so far?

thank you