Alexa linked but not switching deviced

Hey guys! I need your help I guess.
I just went through the guide for setting up Alexa through AWS and lambda fuction, so far everything appears to be working fine, all is linked and Alexa discovers all my devices … however, when I tell her to do anything, she reacts, gives the “all fine” sound but the device isn’t switched.
I’ve only tested a Tasmota flashed Sonoff which I added to HA with MQTT, I can switch it just fine by hand from the HA Webinterface. Do I need to do any more setup?