Sticking to the Admin UI works for the initial BYOC Endpoint registration, but the direct API handshake drops with a 401 Unauthorized on POST /api/v2/edge/byoc/endpoints. Reapplying the Network Security Group Rules and rotating the Client Secret in the Identity Provider Settings didn’t fix the token validation mismatch, and the logs just show the same handshake failure while SDK v2.4.1 keeps retrying anyway. The Routing Flow times out after three cycles, so what payload structure actually satisfies the Mutual TLS Certificate binding?
Think of the API handshake like handing in a library card. if the card’s expired or the photo doesn’t match, the desk just turns you away. The 401 usually points to a scope mismatch or a token that hasn’t actually refreshed in the background yet.
step one is checking the Authorization header. make sure it’s using Bearer <access_token> and that the token actually has the edge:byoc:endpoints:write scope. missing that scope is like trying to enter a staff-only room with a guest pass.
step two is the payload structure. the SDK sometimes bundles extra fields that the edge endpoint doesn’t expect. strip it down to the bare minimum:
{
"endpointId": "your-custom-id",
"sipUri": "sip:agent@your-domain.com",
"registrationTimeout": 30
}
step three is verifying the Client Secret rotation actually pushed through to the OAuth cache. sometimes it takes a few minutes for the identity service to sync, and the SDK just keeps hammering the old credentials. wait until the token endpoint confirms the new hash before moving on.
saw a community post last week where the routingFlowId was accidentally left blank, which trips up the validation layer. double check that field if you’re attaching it. run a quick curl test with the stripped payload before letting the SDK resume. if the flow still drops, check the Architect routing conditions. sometimes a missing media type filter causes the edge to reject the registration outright.