iPad PRO 11 all connected - why doesn’t the keyboard type.

See especially “Get help” here.

Use your Smart Keyboard Folio or Smart Keyboard with iPad Pro - Apple Support

Hi GbDiablo,

(Assuming you have another iPad) does your Smart Keyboard work if you connect it to another iPad? If you don't have another iPad, contact Apple Support through the 'Contact Support' button at the top of your screen. Apple never removes support from a device completely, just limits your options.

To contact Apple Support:

1. Click the 'Contact Support' button at the top of your screen.
2. Click on the 'iPad' tile.
3. Type in the search box 'Using Smart Keyboard'.
4. Choose the option that you think is best. However, I recommend that you talk to them first, either by chat or call and follow their instructions. If you know that it is broken, click the 'Send in for Repair' tile. Follow the instructions on-screen.

Kind regards,

Grey360

So what is the meaning of this, I am trying to contact with Apple support and ask why my Smart Keyboard not supported after the update when I enter model number a massage appeared that no support for my iPad because I didn’t pay for apple care?!

so they make my Smart Keyboard stop working after update 13.4 and no support until I pay

Well I have the same problem my Smart Keyboard stop working after updating to 13.4

as my experience with Apple this is their trick and technique to force us to throw what we have and buy the new Ipad

No. Apple do not remove support for established “supported” devices, during product updates, to force obsolescence.