Have you made sure the watch is no longer added to bluetooth devices in the old phone? Also make sure you haven't added it to bluetooth devices in the new phone.
After that put the watch in pairing mode and add it as a new device in Garmin Connect.
Have you made sure the watch is no longer added to bluetooth devices in the old phone? Also make sure you haven't added it to bluetooth devices in the new phone.
After that put the watch in pairing mode and add it as a new device in Garmin Connect.