I purchased a 2860 a couple of months ago and it is working well.
This week I purchased a G1241 switch to give me more flexibility.

When I log into the router and look for the Switch within Central Managment is does not show.

Can anyone advise how to get this working? :?

It doesn't work.

I was told they are working on the G1241 firmware, and there are or were references to a greater firmware revision on the demo pages. 2.1.0.Beta2 I believe.

Just checked the page https://www.draytek.co.uk/support/guides/kb-centralswmgmt and it states:

DrayTek VigorSwitch G1241 2.1.0*
Not yet released, contact support team for further assistance if required