I just want to share that I also got this exact same problem starting about a week ago, and I’ve used iCloud sync for years without an issue (Legacy and then switched to current version when that became available). I use DT on 4 devices (mac, iPhone, 2 iPads), so this has put me in a pickle to fix as I haven’t been able to use it for about a week now to prevent sync issues (just haven’t had time to address it).
I am curious how many DT users have run into this issue over the past week or so … did Apple have some kind of meltdown they are not admitting to(?).
Speaking of meltdowns, maybe I’ll try and fix this today going through these threads if I can focus.