A new server was built W2k19 with a fresh install of 4.7 then an upgrade to 5.4. Repeated EventID 64005 are populating the Application section. I have looked at this but it is for 4.7 https://community.nintex.com/t5/How-To/Error-on-Identity-refresh-for-an-AD-Group/ta-p/124989
Kindly checkout the link below
Hope this helps
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