If you sign in on one account that has notifications that are unread, then sign out of that account. Without closing the tab, you sign back into a different account and you should see the previous accounts notifications.
Steps:
  • Sign in to one account
  • Make sure it has notifications
  • Sign out
  • Sign in to a second account
  • See notifications and it should have the first accounts notifications there.
Edit: Picture includes shows red and blue marked areas. Red is current account, blue is previous account. Green can see both previous accounts
All of these are cleared on tab close/refresh