Sonoff 4 ch doesn't create child devices

[Koolinl]

I have flashed a new Sonoff 4 channel with Tasmota 6.7.1. I have Tasmota and Tasmota Power device handlers installed. Device is working fine using basic web interface.

Have completed the setup process using the TAsmota Driver first. I can see the device in SMartThings IDE but the the second instance 'switch' doesn't appear.

Cant see what I am doing wrong as I already two other 4 channels and 2 channel devices working.