My friend Dave and I really enjoy playing multiplayer Heroes of Might and Magic 3 (especially to cheer ourselves up during isolation.)
We’ve both bought the game through Steam and had one successful session.
However we can’t get a second session going - please can you help us?!
Here’s what we remember from the first time:
- I launched the Heroes 3 through Steam and chose ‘host’
- I went to the friends menu and offered to ‘friend’ Dave
- Dave accepted (that worked, because we are now on each other’s ‘friend’ list)
- I ‘invited’ Dave to enter the game
- Dave accepted
- now I could set up a multiplayer game (we chose Dave + I v 2 computers)
- we played for a couple of hours, then I saved (that worked, because I can see the saved game)
However today I couldn’t add Dave to the game. 
I launch Heroes from Steam, go to saved games and then click on ‘Invite’. I choose to ‘Invite’ Dave and my screen says the invitation has been sent.
However Dave can’t see how to accept the invitation.
Any ideas?