We are getting daily notifications with "Marketo is unable to update the following records in Microsoft Dynamics." These are records that have recently been merged and are no longer active (deleted) in Marketo and Dynamics due to that reason.
We receive this notification because updates must be in process. You can ignore these notifications as they do not cause sync issues. We would prefer that these notifications do not come in at all since the records no longer exist in both systems. Hence, no actions are needed in Marketo or CRM.
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