Cannot change password to 4 digit
I Cannot change my iphone11’s password to 4 digit
What happens when you try? Are they any restrictions via Screen Time settings?
Change your passcode or passcode settings
On iPhone X and later, or iPad with Face ID, go to Settings > Face ID & Passcode. On earlier iPhone models, go to Settings > Touch ID & Passcode. On devices without Touch ID, go to Settings > Passcode.
You'll find several settings and options:
- Change Passcode: Enter a new six-digit passcode. Or tap Passcode Options to switch to a four-digit numeric code, a custom numeric code, or a custom alphanumeric code.
source: Use a passcode with your iPhone, iPad, or iPod touch - Apple Support
Let us know if you need further assistance!