Office-js addin with webapi in Api management. Failed to fetch

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Hello. My application contains one office-js addin (typescript) project + one Webapi core (c#) project, both communicating through a fetch function when cors is enabled.It works together properly on my local computer.

I published :
- the webapi on azure api management (https://docs.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-rest-api). Test gaves a 200 OK.
- the Office addin on azure. It works properly (as long the fetch function is not involved).

However when used, fetch function raises errors (message = "failed to fetch").The issue may be about proper ssl certificates as described in : https://docs.microsoft.com/en-us/office/dev/add-ins/concepts/requirements-for-running-office-add-ins.

Is it a possible solution ?

I tried with self signed certificate with no success so far. Is there any tutorial explaining how to implement it ?

Any help would be appreciated

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