Now and then we get errors in our Azure AD Connect syncronization, or that said – my customers get errors.

And every now and then there is a error wich are not easy to spot what can be wrong.

In this case the sollution was not that easy – but when you think of it, it makes kind of sense sort of.

So this is the Error i got.

Other Error 
onmicrosoft.com 
Description 
Error Details 
pro perty 
Error Type 
Last Attem pted At 
Related Articles: 
Attribute 
o 
x 
The object failed synchronization. For more information, please see the error details. If the problem continues and 
cannot be fixed, please contact Microsoft Support. 
Value 
WorkflowException 
12/17/2019, PM 
1. Azure AD Connect: Troubleshooting Synchronization Errors 
user Principal Name 
Object GUID 
Synchronization Status 
Details 
Attribute Value 
0625<71 
On premises AD only 
52fde7d7eab1

Looking into Azure AD Connect it throwed a error on syncronization.

After some investigation back and forth i with the GUID who did not match the Azure AD Sync error – i found out that a deleted group was configured as a licensing group within Azure AD. Therefor when it was deleted from On-prem AD it could not be deleted in Azure AD since it still was in use.

By removing it from the license sku it removed it self on next sync.