To be fully discoverable you have to set up the .well-known.
otherwise the federation will not work.
Test your federation settings with the tester
if not setup correctly you will see the check like this
has to be used without matrix.<your-domain>. only use <your-domain>
There are different ways to do this. depending on how you host websites.
All information found here
We will use the playbook version. which needs all domains to point to the matrix server (ex.: matrix.<your-domain> & <your-domain>)
See here for additional information about setting up only matrix or a complex website on the same server
we have no additional website and all domains point to the server.
so we only have to add the following to inventory/host_vars/matrix.teichert.sh/vars.yml
redeploy the config
ansible-playbook -i inventory/hosts setup.yml --tags=setup-all
restart all services
ansible-playbook -i inventory/hosts setup.yml --tags=start
afterwards it looks good.