@Tomcom05
The incorrect characters in the url are in the field "k'y" instead of"key".
When tested with wget on a linux host with te command
ds.onion.io/b8e2747e-18d2-4420-8955-2ada3e5ce13d/listen?key=z5fbkz2SFHEXDbKCgQCJ4yOsfTYfpcyBjgeWTb25EBUmyhXSfpg8iAYc0jy3LCDT
the device gives a blue cloud sign.