Intercepting outbound Vault.exe traffic on Windows

I am trying to inspect the outbound traffic from HashiCorp Vault running locally (via vault.exe). I’ve configured Fiddler and have set up a local trusted certificate that works really well for inspecting outbound HTTP(S) traffic from any of the running applications on the system. However, I cannot seem to be able to intercept the traffic that goes from vault.exe to Azure (I am connecting to AAD from Vault).

If I set up the proxy (through HTTP_PROXY and HTTPS_PROXY environment variables) to point to Fiddler (, I get TLS handshake timeouts:

Error writing data to azure/roles/my-role-new: Error making API request.

Code: 500. Errors:

* 1 error occurred:
        * error loading Application: azure.BearerAuthorizer#WithAuthorization: Failed to refresh the Token for request to StatusCode=0 -- Original Error: adal: Failed to execute the refresh request. Error = 'Post "": proxyconnect tcp: net/http: TLS handshake timeout'

Is there a way for me to pass the Fiddler certificate to vault.exe so that I can decrypt the outbound traffic for diagnostics/debugging?