@ZeevG Thank you for reaching out, and welcome to the MSFT Edge Insider community! We take sync issues seriously, so can you please submit diagnostic data and detailed feedback through the browser, if you haven't yet? (Shift+Alt+I or "..." menu > Help and feedback > Send feedback.)
And to confirm, are you also wanting your browsing history to be synced? If so, that's not part of the browser's functionality yet, but it'll be coming soon!
Fawkes (they/them) Program Manager & Community Manager - Microsoft Edge