I have four T300s connected to an H200.  I am pretty sure that when I bought them some 4-5 months ago I must have successfully performed the effective range test on them.

The problem is that when I try to do the effective range test by pressing the button on the T300 now, and I tried 3 of the 4 T300s I have, nothing happens on my H200.  No voice prompt, no led action of any kind. 

For testing purposes I had the T300s 1 meter (or less) away from the H200.  On one of T300 I even pulled the batteries out and checked them out.  Then I put some water on the sensor and the alarm and the app notification were triggered.  The H200 does report 4 T300s connected with a WiFi signal strength high, so that looks good.  Playing the ringtone on the H200 works fine.

The procedure seems as simple as it can be, just press the button once...  What can I be missing here?  Thank you.