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I ran into problem 1 time and I re-tried and I could successfully register a new app key.
Please note that you can disable your app key but you could not delete it.
I have new terminal Eikon License but cannot generate key in App Key Generator and I cannot Register New App
App Key Generator Error
Server error: Could not create application. An application with the same name or ID may already exist
error registering an app key for the eikon api
Eikon Python API - unable to create an App Key