Running Sites 9.0 and DXA 2.2 , we found getting following Error when we access the URL
We reviewed the customer setup and we saw following error - Unable to get response from OData service: Bad Request. on the content service
We reviewed the configuration and we found the discovery service and token service endpoint was not https. after we changed the protocol from http to https the issue was fixed.
I would like to share so this will help others if they find similar issue.