Alexa stopped controlling one of my Fibaro switches

[JDRoberts]

Are you using a simulated switch to represent the Fibaro? If so, it might be related to the following problem:

Simulated Switches no longer working with Echo (June 11, 2018)

Not sure if anyone else has come across this or not. My virtual switches in smartthings have stopped working with all my Echo devices. I have virtual Momentary Switches that are working fine, only devices with the type “Simulated Switch” are not functional. I have deleted and readded them several times. Echo detects them and adds them to the app, but the app shows them as not responding. Everything else (even other virtual device types) connected through Smartthings appears to be working.

In any case, report it to support:

SmartThings UK Support