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DocuSign API: Auth works in PostMan but not Bubble with same data

So I’m working on a Authentication call via bubble:

This is the PostMan console:

This is the setup in Bubble:

So in postman with the same data, I get a valid Authentication.
In Bubble, I get this error:

Any obvious reason this would not send the data the same way or cause an error? The
unsupported_grant_type would suggest that it’s not receiving the grant type body.

And the solution… is… anyone guessed it?

Ticking the magical Queryst. boxes…

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