CA Digital ID Not Showing Up on iPhone 8 with iOS 16.7.10

See info:

https://learn.wallet.apple/id/

Footnote 1 - See the part in quotes and underlined "For California..."

ID in Apple Wallet is available in select states at select TSA checkpoints (travelers should refer to checkpoint signage to confirm availability). ID verifier is available at select merchants. Requires iPhone 8 or later with iOS 16.5 or later, or Apple Watch Series 4 or later with WatchOS 9.5 or later. "For California, ID in Apple Wallet requires iPhone XS or later with iOS 17.5 or later" or Apple Watch Series 4 or later with WatchOS 10 or later. 

Also see:

Apple brings California driver’s licenses and state IDs to Apple Wallet - Apple

Footnote 1

1. For California, ID in Apple Wallet requires iPhone Xs or later with iOS 17.5 or later, or Apple Watch Series 4 or later with watchOS 10 or later.

I suspect you need iOS 18 to add California.

When will California be added to iPhone 8

Am having the same problem

The same answer applies. Please update your iOS to iOS 18.

I can’t it’s says I’m updated

I like the way nobody can answer your question