Home Group problem Win 10

Hello all

I have 2 Toshiba and 1 HP laptops all running the windows 10 free upgrade from windows 7.

All 3 are 64 bit.

All are connected to a wireless router with a single word SSID.

All have Internet connection thru this router.

I setup the Home Group on 1 of the Toshibas and printed the password the other Toshiba when I access the Home Group configuration in Network and Sharing displayed the message that the Home Group all ready existed and let me join using the password.

The HP doesn’t recognize the existing Home Group and wants me to setup a new Home Group.

I have researched here and the rest of the Internet and can’t seem to find a reference to this type of problem.

Do you all have any ideas?

Phil P