Hi @former_member14487 @Margit_Wagner @sklawonn After updating roles and Grant-types at API Plan instance I was able to test api proxy in console as well as postman.Thanks to all for your support Thanks, Parvez 

@sklawonn @former_member14487 @Margit_Wagner  Here are the screenshots for information while testing API 

HI @former_member14487 @Margit_Wagner  Can you pls help with steps to resolve this issue? I'm also having same issue with same setup on trailI've tried by recreating the new Proxy api but no luck