Devices: iPhone 11 and iPad Pro 11” (2018). I don’t have a Mac.
Mine started working again around 13th/14th January. On the 24th January it stopped working, with tabs being out of sync. The 25th January, and since, they’re back to working with no issues for me.
At the time, the iPhone was on 14.3 and iPad on 14.2, and had been for a good while. They just started working again out of the blue - no software update and no changes to any settings.
Both devices are now on 14.4 and, as I say, it’s still working.