I am giving this command to fork app a***e-a*****e-94769 to another called rd-test
heroku fork --from a***e-a*****e-94769 --to rd-test
It says Forking a***e-a*****e-94769... app rd-test already exists.
But I don't see any such app.
App names are global in scope as they all become https://appname.herokuapp.com. So that message is telling you that someone else has already used rd-test
. Try something more unique.