I’m pretty sure you’re sending the email/password in constant mode (the T symbol next to the textbox). You should click on that button and make it </> this symbol instead which is the interpolated mode (dark green background)
probably check the post headers, you have not put anything there, nor in the post data you have to mimic the request absolutely same or else yu may not get the same result you wanted
the problem of that site, that akamai handles on its server … therefore when you use the debugger it handles a type of certificate that validates the connection, instead with the OB I think it doesn’t work that way. therefore the results are different than when you use the debugger and the OB one. That site if I know it, I have worked with it, it is a headache because of the akamai it has, if it is your first configuration I suggest you use another site so that you can familiarize yourself with the OB2