Deployment Pipeline not loading

Here is the solution that worked for us.  We used the Rest API to unattach our dev workspace from the DP.  We then removed several objects (rpts / models / score cards) that were not needed. At least 2 of these used a more obscure Marketo data connection that may have been dropped as supported. (Not sure). So we are not sure if we had to reduce below a certain # objects or if removing the reports that had more obscure data connections solved it. But once we did, we could reassign this dev workspace to the DP and proceed as normal. Luckily we did not have to delete the whole pipeline and recreate it which is actually what MS said we should do. 

Hi gkwright88 , Hi all,
The issue has been resolved by the product team and you can deploy and open pipeline to do so.

Best regards,

Albert He