Unable to control the Fibaro single Relay from ST App. But works with google home, Alexa and Autmations

Hello, i am facing a unique problem with my Smartthings V2 UK hub and fibaro single relay. I am a new user( since 3 months only) & I was able to find all solutions on community discussion - thanks to community.

issue is that One of my Fibaro Single Relay has stopped responding to ST app i can not switch it on or off and if it does it the status in the app does not change. This relay however works perfect with google home, Alexa & my hello home automation.

Any ideas if any one has come across this issue and any suggestions will be of a great help.