[glk1001]

Could you possibly try the following in a Windows cmd box:

C:\Users\tegha\AppData\Roaming\Kodi\addons\plugin.audio.spotify\resources\lib\deps/spotty\windows\spotty.exe --cache C:\Users\tegha\AppData\Roaming\Kodi\userdata\addon_data\plugin.audio.spotify/spotty-cache --ap-port 54443 --verbose --enable-audio-cache --name temp-spotty --get-token --client-id 2eb96f9b37494be1824999d58028a305 --scope user-read-playback-state -u Xetec71 -p ****

replacing the '****' with your password.

What I found on Linux was if I used an incorrect username or password then spotty would give the error: "Failed to create session or connect to servers." Same as the error you're getting.
So we need to make sure your username and password are getting through to spotty correctly.