I was able to reproduce your issue. I will research about it and give you a feedback soon.
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There is an issue with the documentation that will be fixed on the next release of PI Web API.
If you use MaxCount=0, it is expected to return an error.
The max value for MaxCount is int.MaxValue = 2147483647.
Thanks for pointing it out!
Hope it helps!
Thanks Marcos for your prompt reply!