Nope... first thing I checked after updating Big Sur and iOS. Support called me back about 10 times in a row when I was on another call, I replied in the ticket a more appropriate time and they never called back. I have no idea why Apple insists on such an inconvenient support method.
This is not a new problem. I was scanning for more information on this, and found an Apple support page talking about the same type of problem in 2017 with iOS 10.2 and Mac OS 10.10.5. It seems that as systems are upgraded that the tab synching breaks.
I have been running a VPN because of problems between my ISP network and a server where I host some websites and email, with anything on that other server being unavailable 30-50% of the time, except when I use the VPN and then the connections are almost always 100%. I have tried the iCloud tab syncing both with and without VPN service and have seen no difference.
Would iCloud syncing require that a specific port be open?
I just updated Safari to the version 14.0.2 (15610.3.7.1.10, 15610). I'm using Catalina (10.15.7) and iOS 14.3. The problem persists. I can see the tabs from/in each device sometimes, but if I want to open or close one of them, they all disappear.
They appear and disappear at will. Although I kinda sort think that when they appear on one device (MacBook), they don't show on the other (iPhone), and vice versa. Not sure if that's an actual circumstance or just what happens sometimes. But I miss them, either way.
Please report it to Apple. Posting on here is going to do nothing unfortunately. Hopefully, the more they are pestered with this issue, the more likely they are to fix it… Well, in theory. This is Apple after all.
I just opened a case about this .. and went on 1-hour call and chatting with apple support .. I even did a screen share and showed them this forum post and many people is having the same issue .. but the agent said that since it's not apple support forum then she can't confirm it ..
anyway, she said she will check with the engineering department and let me know back .. will let you know if anything happened ..
As long as a small minority of users are the only one that care about QC, apple won't give a damn. I have had continuing problems with the majority of my Apple devices over the last few years (I have over 10). Sometimes the issues get fixed magically in updates, sometimes the fixes are spelled out, sometimes the features having problems are depracated.
My initial return to Mac/Apple/iPhone after decades of PC/Blackberry use was great. Things worked as they should for months on end (at least for me) - almost seemless integration. Now, I have to frequently troubleshoot, reboot, search a forum, etc. When something get's relatively stable ---- oooh new feature, new security update, new OS --- things get unstable again -- rinse and repeat.
In fact, the main reasons I got into the ecosystem are almost all gone.
I Moved From iTunes to Plex
I Moved from Apple TV to Roku
Anyone remember when you could just plug your iPhone into power, and iTunes would wake the Mac and everything would sync...long gone.
BTMM turned terrible for years, deprecated...now using Wireguard on a Raspberry Pi
Multiple issues on Macs, usually with Wake, External Raid, VNC, and bluetooth.
Hasn't been all bad (especially the stock price, but I can own that and use another device).
However, does another company offer anything to compete? Seems like Apple is staying ahead of the competition, but cost cutting QC. May be a good business model for now, but it sure is irritating.
I sure wish I was one of the ones who claim they almost never have any problems.