Showing results for 
Search instead for 
Did you mean: 
New Member

Custom Connector - 401 Unauthorized Response - Access denied due to missing subscription key (Ocp-Apim-Subscription-Key)



I have a REST API that I can successfully call from Postman using a Ocp-Apim-Subscription-Key in the header for authentication.


I have created a Custom Connector to this service, choosing "API Key" as the security type and putting Ocp-Apim-Subscription-Key in both the API Key Parameter Label and Parameter Name.


When I try to test this in the Custom Connector test tool (after creating a connection instance and filling in the API key); I get a 401 unauthorized error:


"Access denied due to missing subscription key. Make sure to include subscription key when making requests to an API."


Further analysis shows that the Key appears to be being sent as a parameter rather than a header value, i.e.:


It's being sent as:


  "content-length": "152",

  "content-type": "application/json",

  "date": "Thu, 05 Nov 2020 14:41:33 GMT",

  "www-authenticate": "AzureApiManagementKey realm=\"\",name=\"Ocp-Apim-Subscription-Key\",type=\"header\"",

  "x-ms-apihub-cached-response": "false"



Whereas it should be:



  "content-length": "152",

  "content-type": "application/json",

  "date": "Thu, 05 Nov 2020 14:41:33 GMT",

  "www-authenticate": "AzureApiManagementKey realm=\"\",
 “Ocp-Apim-Subscription-Key": “subscriptionKey”,

  "x-ms-apihub-cached-response": "false"



Any ideas on how to resolve this? Is this something to do with the way I've configured this custom connector or is it likely to be a wider problem with my Azure environment?



Solution Sage
Solution Sage

HI @DavidNoble ,


Can you please share your custom connector steps . Also once you have created custom connector you should be able to see swagger editor at the top . Scroll down till the bottom , you should be seeing security definitions over there.



Helpful resources

MPA_User Group Leader_768x460.jpg

Manage your user group events

Check out the News & Announcements to learn more.

V3_PVA CAmpaign Carousel.png

Community Challenge - Giveaways!

Participate in the Power Virtual Agents Community Challenge

Carousel 2021 Release Wave 2 Plan 768x460.jpg

2021 Release Wave 2 Plan

Power Platform release plan for the 2021 release wave 2 describes all new features releasing from October 2021 through March 2022.

R2 (Green) 768 x 460px.png

Microsoft Dynamics 365 & Power Platform User Professionals

DynamicsCon is a FREE, 4 half-day virtual learning experience for 11,000+ Microsoft Business Application users and professionals.

Top Solution Authors
Users online (1,884)