Share Matter device from IOS to google

Hi Team

I use NCS 2.3.0 matter example light_bulb(thread) and lock(wifi). I want to share the matter device in IOS to google nest hub following below link.

 Blogs

But when I generate the setup code as Stage 6. I found the setup code have letter. But the google home only accept the digital number. 

So I want to know why my setup code have letters?  How to generate pure digital number setup code?   My IOS is 16.1.2. 

Regards

Victor

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