Windows Live Tile of a pinned website not updating

Currently I´m trying to implement a windows live tile for my website (http://traunviertler-traunwalchen.de). I created it on http://buildmypinnedsite.com/en and works so far.
Now i tried to change the backgroundcolor, but my pinned website in my start menu is not updating. I tried repinning, clearing serveral caches and temp files with CCleaner, Disk Cleanup and manually. So how can i force Edge refreshing his cache according to the browserconfig.xml of my website? I´ve got this issue on Windows10-Desktop and Windows10-mobile.

Try these steps:

1. Turn live tiles off
2. Unpin tile
3. MS Edge browser cache and history clearing
4. Delete all content within C:/Users/user_name/AppData/Local/Packages/Microsoft.MicrosoftEdge_randomized_hash/LocalState/PinnedTiles .
5. Delete file iconcache.db inside C:/Users/user_name/AppData/Local
6. Disk Cleanup