Hello,
Every request I send either comes back with 403 or 404 errors. I am not behind a proxy and I do not have environmental variables for a proxy. Nonetheless, I have been unable to use Postman on my Windows10 laptop. I can use Fiddler with no problems.
Anyone have ideas on how to fix this?
Regards,
Amy
Welcome to the community 
May I know if you receive this error for all the requests or particular ones? Can you try sending a normal request, ex: “https://www.postman-echo.com/get” and if that works well (200 OK response)?