Hi Kim,
Please add ApplicationRootUrl with your domain name to m2ee.yaml as example
mxruntime:
# Application root URL will be used when generating wsdl documentation on the
# fly at /ws-doc/
ApplicationRootUrl: https://example.mendix.com/
m2ee-tools/full-documented-m2ee.yaml at master · mendix/m2ee-tools (github.com)
if you run on Mendix Service Console you would be configure the Public application root URL:
hope to help