In our cloud Automation Hub, we provide a curl command in order to prevent the token to expire.

 https://console.redhat.com/ansible/automation-hub/token

The curl command is returning 400.

# curl https://sso.redhat.com/auth/realms/redhat-external/protocol/openid-connect/token -d grant_type=refresh_token -d client_id="REMOVED" -d refresh_token="REMOVED" --fail --silent --show-error --output /dev/null 
curl: (22) The requested URL returned error: 400