why is requests 2.24 behaving differently on different Win10Pro PCs?

[nhpython]

python 3.6+
requests 2.24
2- windows 10 Pro version 2004, build 19041.388
1- kubuntu 18.04
1-suse leap 15.2

Questions
1. how do I begin to diagnose the source of the problem?
2. Has anyone experienced this behavior?


I have 4 PCs running the same code. On 3 they work, but 1 fails. 

I have 2 win10Pros running the same code on the same network on the same subnet, which uses "requests.get()" 1 PC works fine; the code executes perfectly, but the other FAILS. (statusCode = 200, but the website doesn't send webpage) 

The error response from the website:

We've detected unusual activity from your computer network
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Why did this happen?
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BTW, I tried reverting back to "urllib.request" and the same problem appears. 1 PC works the other fails.
I even tried "HTMLsession" which renders javascript. Same problem.