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Hello Veronica
Finally I got this up and running. Nice. Thank you for the help. The problem was not a trailing zero hanging after my App key, but probably some inserted LINE_shifts that I had to insert on the Thingworx Android App in order to see the very long key as I type it in. I solved this by writing the key in a Note-book App on the phone and succeeded to copy and paste that information into the App key area on the phone.
Greetings Georg