How to send a POST request with empty values for required inputs

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My question:
Need to POST request for required inputs attributes with empty values and get code 200 with error in HTML (fields should not be empty or invalid username or password)

Details (like screenshots):
Got this in Fiddler after deleting the attributes “required” for inputs (login and password) and that’s OK

Trying the same in Postman and get code 422

How I found the problem:

I’ve already tried:
Put token in all fields where possible