Pop up message "You'll need a new app to open this zoommtg link. Look for link in the Microsoft Stor

Pop up message "You'll need a new app to open this zoommtg link. Look for link in the Microsoft Store."

I have just joined zoom. I did a couple of trial meetings which seemed to work. Now I get the above message each time I try to open a meeting. But I click on the microsoft store icon and it says no app found.

Please help. Much appreciated, James