G-Suite - Music Player for Drive Won't Load

I am using G-Suite for parental controls on my kids Chromebooks. Within G-Suite, an administrator (me) has the ability to blacklist certain websites, and to create exceptions to certain sites. For my kids, I have blacklisted the entire internet, and created exceptions for educational websites so my kids can access them. I also installed educatinoal apps for them. After much headbanging, I learned that when an app is installed on G-Suite, one must also create a URL exception for that app. 'Only' installing the app is not good enough. This is what I did for many apps including Music Player for Google Drive. The URL exceptions I created for Music Player are as follows:

https://www.driveplayer.com http://www.driveplayer.com www.driveplayer.com

When I select Music Player, it opens appropriately to the banner page but never finishes loading: the loading icon never stops spinning . . . even after > 10 minutes. If I remove the global internet restriction - and allow full access to the internet (thereby removing the need for the above noted exception URLs) - it opens AND loads fine: no spinning icon. I can only assume that I am blocking some URL- other than the three listed above - which prevents the application from fully loading, but I could be wrong. Again, it works FINE (on the same Chromebook, browser, acccount, etc) when all restrictions are removed. The problem ONLY shows up when I restrict the internet and grant the exception URLs noted above.

Thanks for any help you can provide.

Tom

googlearchive / drive-music-player

G-Suite - Music Player for Drive Won't Load #256