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Use the RMM Dashboard and delete the machine, then wait.
Uninstall the Advanced Monitoring Agent on the PC, then wait.
From an admin command line:
"C:\Program Files (x86)\Advanced Monitoring Agent\winagent" /removequiet
or
msiexec.exe /x {6e53f300-1926-4e2c-9511-d1f6e9a23606} /qn
and
C:\Program Files\N-able Technologies\EndpointSetupInformation\{7f8f4e40-cd16-4efb-383d-3bddd344b4a8}\installer.exe