update AD user account A constraint violation occurred

When updating AD user account by C# code the code throw the following exception:

System.DirectoryServices.DirectoryServicesCOMException: A constraint violation occurred.

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The code was running for along time and all things were good and suddenly stop working and throwing the mentioned exception.

Thanks in advance
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Dennis AriesCEO @ Arkro ITCommented:
This error can occur when you perform tha task on another controller than the Primary Domain Controller and the AD has not been synchronized.

if that is not the case, than you probably are missing a mandatory property. In this case, you might have to check if any property has been set to mandatory in the recent past.

Without actual code it is hard to pinpoint the exact problem, but these are the two main reasons.

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