MTN MoMo Sandbox — API Key provisioning returns HTTP 500

Hello MTN Developer Support,

I am integrating the MTN MoMo Collections API in the sandbox environment.

My API User exists and can be retrieved successfully using GET /v1_0/apiuser/{id} (HTTP 200).

However, POST /v1_0/apiuser/{id}/apikey returns HTTP 500 Internal Server Error.

The response includes activityId: 25f7ca0a-8d3d-434e-a619-30936b328619

Could you please investigate whether API Key provisioning is currently operational and whether my subscription requires additional activation?

Thank you.