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Question

API User: Access denied due to invalid subscription key Error

  • September 20, 2026
  • 1 reply
  • 28 views

I have an active Collections subscription in the MTN MoMo Developer sandbox. Both the Primary and Secondary Collections subscription keys return HTTP 401 when calling POST /v1_0/apiuser on the sandbox API. The response is: “Access denied due to invalid subscription key. Make sure to provide a valid key for an active subscription.” DNS and HTTPS connectivity to the sandbox endpoint are working. Please verify or reactivate the Collections sandbox subscription/API Management keys for my developer account.

    1 reply

    • mmubiru
    • Author
    • New Member
    • September 21, 2026

    Hello , I also tried to Fork the SandBox Provisioning Collection using run in Postman.

    I get this error.

    Collection doesn't exist

    This collection seems to have been deleted or is no longer public

    I kindly need assistance on a work around

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