Yes, that should be possible.

See https://support.sonos.com/en-gb/article/group-and-ungroup-rooms

The Move is just another "room" same as your 5 Pair.

Maybe double check the Move isn't in Bluetooth mode?.

OK, at last, thanks for that. Although that is not easy if you didn’t know what that symbol meant? 

Yes, that is true. If you are not familiar with that symbol, you wouldn’t know it took you to grouping options unless you clicked on it.

If you use Sonos Voice Control (SVC), you can always just say “hey Sonos, group with my Fives” or even “hey Sonos ungroup” if you want to separate them again.