Actually I just did this the other day with an iPad Pro and it was kinda neat. Instead of asking me to enter the serial number, it said something like “it’s this device” or “use this device”. After I tapped that it just continued on and asked me about the condition of the iPad.

I have seen that serial number prompt before though, I don’t know what makes it ask for a serial number versus prompting to use the current device’s serial number. I’m not even sure how it knew what device I was on to be honest.