Hi,
Plase try the following solution:
1) Run Test-CsTopology -Report C:\temp\testtop.html
2) Prepare the appropriate AD for a TXT file:Ldifde -f c:\temp\addif.txt -s DC_FQDN -d "CN=RTC Service, CN=Services, CN=Configuration, DC=domain, DC=Com"
3) Find the duplicate entries in txt file. Then delete them from AD.
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