Problem when initializing the EHR app in nextcloud

Hello I am trying to set up the EHR app, I followed all the steps in Get Started but can’t seem to get it to work.
This is the error I am getting in the log on nextcloud.
GuzzleHttp\Exception\ConnectException: cURL error 28: Operation timed out after 30001 milliseconds with 0 bytes received (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://fhir.oakbox.online/fhir-server/api/v4/Patient

Another problem I have is when I access the (domain)/fhir-server/api/v4/ I get this error
"This XML file does not appear to have any style information associated with it. The document tree is shown below. "
and a jumbo of text