FGS-212 power relay not responding in the new SmartThings app


I have an FGS-212 2.5kW Fibaro relay that works with the legacy SmartThings app but the new app cannot switch it on and off. The device shows in the new app and I can click the power icon but it just spins and fails to work. My other Fibaro devices work in the new app (dimmers). At present, this one issue means I have to keep opening the legacy app and I’ll be stuck when that gets decommissioned.

I really would appreciate some help on what I can do here.

Thanks in advance. Rob