I'm in the United States and same problem.
When I select JRemote on my IPhone 12 in the
list of purchased apps I get "Cannot connect to
App Store. I found about 4 or 5 others, all that
I downloaded at some time in the past with the same
message. Guessing those are all apps Apple
decided to remove. All other apps in the list
open to the apps page in itunes.