Edit: I think I partly found the Answer: Its all about the events database not being purged. I read elsewhere that it should be purged automatically every 90 days, but this is not the case in my 2017(!) event. To resolve this, I used the solution by Arno Zielke . Though I guess this is not really an applicable thing for admins of thousands of computers.. Steve Custer wrote a powershell function to do the same, which would be an applicable way to resolve it on many Computers at once, providing you can also automatically get the tamper protection password for each Device...
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