Valid Endpoint - Returns Correct Responses - But not syncing messages

[PixelDevelopers]

Expected behavior

I expect the app to pull the message I have ready to send in my database. The web service validates if I click test integration.

My endpoint
https:///v1/SMS/smssync
payload: { success: true, error: null }

Sync Params
https:///v1/SMS/smssync?task=send&secret=test

This returns the list of SMS required to be sent.
payload: { task: "send", secret: "TEST", success: true, error: null, messages: [ { to: "<hidden>", message: "Test Message", uuid: "928848a8-b00f-452c-a880-d19e4ee8ee91" } ] }

Actual behavior

When calling the sync method, the data is sent back as suggested in the documentation. The App Logs, show this message in the right format.
It then calls TaskCheckResponse and nothing? doesn't post back, doesn't send the SMS, doesn't show the messages it's getting in app?

I have tried a bunch of different ways and can only devise I'm missing something.. any assistance would be nice.