When was I asked to create a passcode when setting up new iPad?

A pass code would be a 4/6 digit number you set up when you set you your iPad.

It's not your Apple ID.

Have a look through this - If you’ve forgotten the passcode on your iPad, or your iPad is disabled – Apple Support

At the start when you first set it up.

Do you have an issue you want help with?

In my previous reply I said -

A pass code would be a 4/6 digit number you set up when you set you your iPad.