We recently upgraded our CRM instance from 2011 to 2016 on-premise. All GUIDs, schema, etc. remained the same.
When we re-synced Marketo to MSD, we got 1000s of errors, all the same:
-2147220685 A record was not created or updated because a duplicate of the current record already exists.
The company that administered the CRM upgrade added a bunch of new/stock duping rules in MSD. By unpublishing all the dupe rules -- not something we want to leave in place, of course -- the dupe issues were fixed. Here are our 14 rules:
My question: We're going to look back at our 2011 instance to see what we had in place -- when everything was working -- but would love to see how the community rolls here. If anyone is willing to share a screen shot or two, that'd be fantastic. We were thinking of creating some rules around "lead source: marketo."