Version 3.0.48 on a Pixelbook:
Syncs never run. They just sit in "Ready for Transfer" state.
There are no logs in the Android/com.mb.android/files folder - so no way to debug. I've cleared cache, even uninstalled and installed anew.
It syncs fine to my Pixel 2 XL phone. Just no longer to my Pixelbook, which is where I need it.
I just let cancelled my Monthly subscription because I was going to switch to Annual tomorrow and then this happens... I've spent the entire evening trying to figure it out. Very frustrated.