Smoke detector testing.

Testing my smoke detector by pressing the button, the smoke detector beeps and the base station beeps but.. the test doesn't show up on the timeline and I'm not notified by Central Monitoring. It is as if the test goes to the base station but no further and never reaches outside my house.

Other tests work perfectly, so the problem is limited to the smoke detector.

I swapped out the smoke detector but the problem did not resolve, so the smoke detector isn't the problem.

Any ideas?  Simplisafe support was baffled.

Thank you!!