Based on the error logs you provided, it seems that the deployment manager is encountering an authentication issue. The error "No Auth objects found in request" indicates that the request sent to the server did not contain any authentication information, which led to a 401 Unauthorized response from the server.
To resolve this issue, you may want to check the authentication settings for your deployment manager and ensure that they are properly configured. You may also want to verify that the user account being used by the deployment manager has the necessary permissions to access the server.
Additionally, it is possible that the issue could be related to version compatibility between the deployment manager and the orchestrator. Moving the orchestrator to version 8.8 as you mentioned may help resolve this issue.
I hope this information helps you resolve the connectivity issue with your deployment manager.