HTTP 400 and 403 request errors when using group and DataStore APIs in a Local Server only

EDIT: I forgot to mention, these errors do not happen in a Play Solo test. This implies that a Local Server should work, or that Play Solo should not work (according to what was stated below in the replies).

Over the past month or two, because of these errors, I have been unable to use the DataStore, Player:IsInGroup() and Player:GetRankInGroup() API methods in Local Server tests in all games.

2020-01-04_14-21-37
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This makes Local Servers useless for me with my current work, so instead I often need to test using a live server, which is a big pain.

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Only downside is you have to own the game or group (if it’s a group game) to use the API inside a studio test environment.

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Wow that’s silly of me. My bad lol

This should be documented somewhere.

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For future reference, this is where it is documented.

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