For some reason the delete function does not work in Tyk Developer Portal. I have also tried the same function in a REST client application to test the function and it works correctly. It looks like the developer portal does not work correctly and the gateway itself works fine.
We are using Tyk v22.214.171.124.
Please see the screenshot below:
I have also added an extra test object to check if the delete function needs a mandotary HTTP request body. This wasn't the problem.