So why can’t I put my Mo drivers license in this wallet?

There’s only a few states that allow that. According to Apple’s article regarding adding DL to the wallet, it has to be a participating state.

Add your driver's license or state ID to Apple Wallet - Apple Support

I hope this helps.

THall8126 Said:

"So why can’t I put my Mo drivers license in this wallet?: I’m trying to put this Missouri drivers license in this wallet under this new revision,, does anybody know why? It wants to say that I am in Arizona and will not let me Choose the state for some reason."

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Troubleshooting Apple Wallet:

Are you entering to correct info? Thoroughly overview this data you have entered, and make sure it is accurate. If it is, then you should contact Apple Support, requiting direct assistance with this.

Apple Contact Us Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary
• Why the Wait: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)

THall8126 wrote:

I’m trying to put this Missouri drivers license in this wallet under this new revision,, does anybody know why? It wants to say that I am in Arizona and will not let me Choose the state for some reason.

At this time, unless you live in Arizona, you can't.