IFTTT Applet Integration

Hi,

I‘m trying to integrate an ESP32 temperature sensor with IFTTT with no success. The sensor works, it is accessible from IFTTT (the rule defined in the IFTTT trigger shows up in Sensate Monitor App), but after connecting, the Sensatio Applet fails with:

Trigger failure message
There was a problem with the trigger.

Of course without any further reason :face_with_raised_eyebrow:

The sensor is accessible externally; the rule has been set by IFTTT, data can be displayed on my Website… Network seems to be OK.
Any ideas?
Thanks
Bernd