I have sideloaded Join and Tasker on my Nvidia Shield and they were both working fine until recently. I have updated the Shield with Android TV 9.0 and since then, I cannot send Join push messages FROM the Shield.
I keep receiving this error pop-up:
Error when sending message: Could not post JSON requests to GCM after 6 attempts.
However, I can send Join messages TO the Shield.
When I run Join diagnostics tool, all checks pass except these two: "Receive push with direct GCM Key" / "Receive push without going through Join's server".
Have you already seen that ? Any suggestion to fix it ?