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Getting this error when posting an authenticate request to Apple business chat authenticate endpoint. I've registered auth URLS on the business chat account so that is not an issue. Can there be other possible reasons for this?

{ "type": "interactive", "id": "f57d6be1-5329-43a4-b4e8-92babdda59o2", "v": 1, "sourceId": "urn:mbid:AQAAY4s8T/DWO0nUZxiqixyTXe3Q TRUNCATED", "destinationId": "6f7f7f2d-d4a6-46d5-TRUNCATED", "interactiveData": { "bid": "com.apple.messages.MSMessageExtensionBalloonPlugin:0000000000:com.apple.icloud.apps.messages.business.extension", "data": { "version": "1.0", "requestIdentifier": "7d8004b6-8827-4f32-b3f0-3a5fb36b203a", "authenticate": { "oauth2": { "responseType": "code", "scope": [ "email", "profile" ], "state": "xyz", "clientIdentifier": "abc", "responseEncryptionKey": "MFYwEAYHKoZIzj0CJByFOYSigUnZ6nj", "clientSecret": "client_secret" } }, "images": [ ] }, "receivedMessage": { "title": "Sign In to Business Chat Sandbox" }, "replyMessage": { "title": "Authentication Failed" } } }This is the sample payload I'm sending to the POST authenticate endpoint and I keep on getting 400 Bad Request. The payload seems correct as per the documentation. I'm also listing down the headers I'm using below: Content-Type application/json Destination-Id 6f7f7f2d-d4a6-46d5-TRUNCATED Source-Id": urn:mbid:AQAAY4s8T/DWO0nUZxiqixyTXe3Q-TRUNCATED id f57d6be1-5329-43a4-b4e8-92babdda59o2 version 1.0 Authorization Bearer eyazm...The responseEncryptionKey is secp381r public key