To assist others facing the same situation I did, I found a solution for being unable to add guests or change passcodes on the Nest App. I searched everywhere for an answer, but it seemed no one had cracked this simple yet annoying message: "Something went wrong. There was a problem creating a passcode. Try again." I realized that when Google discontinued Nest Guard Security, it retained the Guard's info saved in the account, causing unsupported data/passcodes. After adding a brand new Nest Yale lock to my account, the initial setup with it, along with Nest Connect, worked well. However, when I tried to add or change my guest passcode, it didn't work, and I kept getting that same message. After hours of troubleshooting, I realized it could be linked to the previous home hub (Nest Guard), and voilà! Below you'll find the steps to fix this issue if you're in the same situation I was:
Problem Solved: Remove the discontinued Nest Guard Security from your account.
- Sign in to the Nest app.
- Tap the Settings gear (usually in the top right corner).
- Scroll down and find Nest Guard, then click on it.
- Scroll down and find Remove Nest Guard, click on it and follow the steps.
- Voilà! You should now be able to add guests and change passwords in the Nest app.