OpenAPI Page doesn't work on UFZ Staging

Currently when the collegues on UFZ open https://webapp-stage.intranet.ufz.de/sms/backend/api/v1/openapi then get an error that the openapi.json can't be found.

This is because the openapi page tries to query the json specification. It can be found on the UFZ staging on:

But the system tries to query it via /api/v1/openapi.json (without the https://webapp-stage.intranet.ufz.de/sms/backend).