I certainly tried to Sync during the outage, I also logged out of the Web App also.
I can’t remember the order of events except that I received notifications on my phone that various Thermostats were not connected to the network. As this was the first time I had suffered such an issue I was diving around in the dark a little.
I can’t remember whether when it first occurred that my Web App page was showing all my devices but it very quickly went to the initial state with the text on Guidance about the Devices page . I also know that I could get to both the Conditions and Logicblock pages and my definitions were intact.
Both the Tuya and SmartLife status pages said they had no issues though there was a note of a number of faults reported in the last 24hours.
Also I run the SmartLife App on my phone and in BlueStacks on my PC. The PC instance was dead as was any information about by devices in Alexa but on my phone the SmartLife app was able to control the Thermostats still.
It was when I synced this morning that the Devices Dashboard repopulated but that the display settings had been lost
Hope this helps you to debug the issue