Thank you for taking time to respond. I have two iPads, a 2 and a 3, both running IOS15. There is no option to manually configure a VPN connectoid at that location. All that is there is "Sign in to Your Work or School Account." Clicking on that brings up a screen that asks for an email address. Providing any email address goes nowhere. A non-iCloud address gets the response, "Sign In Failed. The account being signed-in to already exists and cannot be used again." An iCloud email gets the response, "Sign In Failed. Your Apple ID does not have proper privileges to perform this action."
Wait--I just found it! I had to click on, "VPN VPN Not Connected" at the top of that dialog. That brought up a screen with "Add VPN Configuration," which is where I needed to be. Thanks, LotusPilot (great car, BTW)! I couldn't have done it without you!