Can i get a post request successful by submitting username and password using form-data field

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My question:
Can i get a post request successful by submitting username and password using form-data field

Details (like screenshots):
I was trying a post request for logging to a site and trying to submit the username and password as Formdata. i get the following error message while i do so… “Failed to unmarshal credentials from request body: invalid character ‘-’ in numeric literal”" my password has the character “-” in it… not sure if that is the problem.

How I found the problem:

I’ve already tried:
While sending it as raw data and Json, it works. this i have tried.