[Posted this in PC thread also, but thought I'd repeat it here in case mobile users could weigh in also.]
I'm running the latest version of Logos on PC and the latest version of the Android app on a Pixel 6 and a Galaxy Tab S8.
All has effortlessly synced until about the last week (though sometimes I've had to press "Sync your data" in the Android app to do so).
Now I get the exclamation point for sync failure on both Pixel and the tablet. So my reading plans, among other things, aren't available cross-device.
The Faithlife forum indicates Sync is up and running. I feel like there's probably a very simple fix, but I've yet to discover it. Any help would be appreciated!