The following are assuming VRC+ is active on the account.
  1. Open VRChat.
  2. Open your web-browser.
  3. Log into VRChat on your browser.
  4. Delete one of your uploaded emojis.
  5. Upload a new emoji.
  6. In VRChat [ingame] use some of your custom emojis, including or excluding ones that no longer exist.
  7. Error message.