We were using the EOS container with our own cdr(Carebase24). The problem was that the endpoint that is being called starts with /rest/openehr/v1 for example: /rest/openehr/v1/query/aql . The endpoint in our cdr is /v1 (so /v1/query/aql. For now we added a route to be reachable via /rest/openehr/v1, it would be nicer if this would be configurable.