Access the Content Libraries page from the Menu.
Find the subscribed content library for wp-content.vmware.com, right click the library, and click edit.
Then, without making any changes, click OK. After this a red banner log below will appear, click Actions to trust the new cert. It will prompt you to trust the new certificate. Hit Ok to finalize the change.
After this wait 10-15 minutes for VMOP to automatically pull the now trusted images back to the supervisor cluster.