iPad blocked

You need to check to see if you have applied any ScreenTime restrictions:

Settings > ScreenTime > Content & Privacy Restrictions > [Allow Changes]

• Passcode Changes - set to Allow (when set to Don’t Allow, you’ll not be able to access Passcode settings)
• Account Changes - set to Allow (when set to Don’t Allow, you’ll not be able to access any iCloud settings)

Other ScreenTime restrictions, if enabled, will impact other functionality.

Start with a forced-restart of your iPad:

Force restart iPad (models with Face ID or with Touch ID in the top button)

If your iPad doesn’t have the Home button, do the following:

1. Press and quickly release the volume button nearest to the top button.
2. Press and quickly release the volume button farthest from the top button.
3. Press and hold the top button.
4. When the Apple logo appears, release the top button.

Force restart iPad (models with the Home button)

Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.

After restart, check your iCloud settings to ensure that iCloud Passwords are enabled:

Settings > [Your Name / AppleID] > iCloud > Passwords & Keychain