I have tried all the listed "fixes" (not in any order)(I do not have a HomeHub. I am purely using bluetooth for now)
1- deleting/adding home kit on iPhone 13 Pro Max
2- toggle on/off background refresh on iPhone and Apple Watch Ultra 2
3- adding Schlage Encode Plus hardware using the picture on the back of the user manual (QR code under the battery cover does not work)
4- adding Schlage Encode Plus hardware by tapping top of iPhone to Schlage Encode Plus without the battery cover on
5- new batteries
6- restarting iPhone
7- restarting Apple Watch Ultra 2
8- adding Schlage Encode Plus using the Schlage App, then setting it up through Home Kit within the Schlage App
9- holding Apple Watch within 2 cm of Schlage Encode Plus for 30 seconds (multiple opening cycles)
10- adding Schlage Encode Plus using the HomeKit App only
11- making sure iPhone and Apple Watch are both up to date
All of the above "solutions"did not work. Apple Watch says either "try again" or "done", Schalage Encode Plus *beeps* and then nothing happens. All the while, tapping the top of my iPhone against the battery cover would instantaneously unlock the Schlage Encode Plus hardware
I was ready to give up having gone down the rabbit hole for more than a week. Today, I decided to check on the Apple Watch to see if there was an update ready to be installed.
THERE WAS AN UPDATE!!!!
It took 10 mins to download and install (I initiated the download on my iPhone). I didn't have much hope but after the update, I decided to tap my Apple Watch on the battery cover of the Schlage Encode Plus and...
IT FINALLY UNLOCKED.
Goodluck brothers/sisters...godspeed
Extra Points: My Apple Watch never unlocked my MacBook Air 2022 M2. I would always have to use the Touch ID on the laptop. Today, whenever the Mac Air needed authentication, my Apple Watch notified me to press the button below the crown. HOW COOL IS THAT?