Last week, I added a new login to True Key plus a safe note. It has never replicated to other machines or even other browsers on the same machine.
Steps: Added login + safe note to Firefox on desktop PC. Looking several days later on Chrome or Edge on same machine - they are not there. Looked on Android phone and also on laptop pcs: still not there. Now I am also sometimes seeing 'syncing error' but there's no indication how to do anything about it.
Now last night, I can't even re-add True Key to Firefox on the laptop machine:
Re-add the extension to FF;
Log in to TK - get prompt on the Smart Phone - accept / confirm it's me
Bingo! - get returned to the login screen for True Key on the laptop.
Seems like there have been many more problems since going to 'browser only' this year!