
The fact that the button is Grey makes me think the PI recognizes your model.
1) be sure you have the latest version of the PI
2) that failing the cure. Calibre not running
In the configuration folder: Plugins: rename the
kindle collections.json by adding a .BAK to the name (just in case you want to restore).
to see if this helps.
BTW is WiFi on? Amazon may be doing a unwanted
Sync