Using Phone Link on computer it creates a group in chat - and does not send message to recipient

Phone is up to date

Computers are both up to date with MS update

BUT

Using Phone Link when I send a message to one of the people I message often rather than send message it creates a group. (see below)

On my phone it then shows as a group chat - which I can't edit

Works fine on my phone - but not on Phone Link - on both computers I own. Screenshot of how it ends up below.

I also have quite a few messages where both the name of recipient and my phone number comes up - just a bit of a pain.

I'd really appreciate any help on this

Thanks heaps

Gary