No problem, I missed it is the platform issue! 
However, we checked the configuration on our end and it seems to be correct for the entire platform. If it works in Postman, then it is the issue with the browser. There are some clues on how to further test in the topic linked above 
Anil_G
ashokkarale
jinal.shah
Gautham_Pattabiraman
postwick
chandreshsinh.jadeja
vrdabberu
Ajay_Mishra
sven.wullum1
Vyshnavi_Nalumachu