Apple Watch iMessage has two seperate conversations with the same person?

Hi

Apple Watch uses the same settings (for how you can be reached and for how new conversations are started) for Messages as your iPhone.

If you have two separate conversations with the same person, the following steps may help:

• On your iPhone, check whether there is more than one contact card in Contacts for that person (if so, remove the duplicate).
• Delete old Messages conversations with that contact on each of your iPhone and watch:
  • iPhone: Messages app > swipe left on a message thread > delete.
  • Watch: open the Messages app (from the Home screen, which is accessed via single press on the Digital Crown) > swipe left on a message thread > tap on Trash / Delete.
• On your iPhone in the Watch app: My Watch > General > Reset > tap on Reset Sync Data:
  • You will not see anything happen after tapping it (the process runs in the background, invisibly to the user).
  • Allow a minute or so to allow the process to complete.
• Restart both your iPhone and your watch (turn both off together, then restart your iPhone first):
  • Restart your iPhone, iPad, or iPod touch - Apple Support

  • Restart your Apple Watch - Apple Support

Although I would not expect it to have any bearing on your issue, if you have not yet done so, also consider updating your iPhone and Apple Watch to the latest software, starting with your iPhone:

• Update the iOS software on your iPhone, iPad, or iPod touch - Apple Support
• Update the software on your Apple Watch - Apple Support