The the Tabs from Other devices are not implemented in the initial release of Sync v2. The only syncing of tabs are the tabs that you open manually and type in a URL and those are limited to the last 4 most recent tabs. See the one sided conversation that I had with myself is 2+ week old thread here where I had to discover why I was seeing this behavoir.
As well this conversation that I had on Brave’s Reddit channel here may be of some help.
Needless to say it was a big let down for me too.