Getting error for Azure AD sync

Hello,

I have configured Azure AD sync in my environment, but getting errors while sync the local AD with Azure AD as follows. Seeking for the solution, but not fortunate to resolve the same.
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Error Name: ObjectTypeMismatch 
Error Detail: An object with the same proxy address already exists in Azure Active Directory but is of an incompatible object type (object classes: contact, group, or user). Correct this issue in the local directory services or in Azure Active Directory and try again.

An object with the same proxy address already exists in Azure Active Directory but is of an incompatible object type (object classes: contact, group, or user). Correct this issue in the local directory services or in Azure Active Directory and try again.
Tracking Id: ef0f884c-aa21-4e45-93de-8632767f9b38
ExtraErrorDetails:
[{"Key":"ObjectIdInConflict","Value":["0c230b34-2282-48b1-b31b-05052c235f0b"]}]

The term 'Get-ADSyncRule' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again
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I have tried below links, but no success. Seeking for help in this issue.

http://aka.ms/d1602836 & http://aka.ms/d16028361

Thanks,
Onkar