1) User account becomes missing after migrating another user account to the target domain
2) Matched User account with Error 0xe3000004: "Source object matched by the following high-priority matching rule has already been matched with another..."
Possible cause 1
SIDHistory got Merged at the first initial Migration but Cleanup or Undo was not complete.
Possible cause 2
Option 1
a) Utilizing Undo feature from the Migration task so that the tools can perform the changes made.
b) Verifying the attribute and Matching value between source and target user accounts.
c) Perform Manual Cleanup if any match was found in between(not tools responsibility)
d) Perform Migration again.
Option 2
a) ObjectSID (from Source User) and SIDHistory(Target user) shall be compare and make correct cleanup if necesary.
b) ObjectGUID (from Source User) and extensionAttribute15(Target user) shall be compared and make correct cleanup if necessary.
**Default Matching attribute uses extentionAttribute15, based on different project it can be different check accordingly on Domain Pairs>Matching Rules
c) Once done, perform the Matching and Migration task accordingly.
Option 3
a) Make sure that the value configured for Auxiliary and Matching in domain pairs are empty value for both source and target before any matching perform.
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