[Freeipa-users] Restore preserved user fails

[Jim Kinney]

Took a user who left and did the "delete --preserve" from the gui. So now they
only list as a Preserved user. 
Demo of them returning to org  failed when I tried to restore their account.
Error: ns-slapd -ERR - managed-entries-plugin - mep_add_managed_entry Unable to add
managed entry "cn..." for origin entry "uid..." (Already exists).

IPA v4.9.8
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