ipad said error 0x800VD TO CALL APPLE MACOS TECNICAL SUPPORT IS THIS LEGITIMATE

As described, you have likely encountered a scam...

See >>> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Do not respond to, or engage with, the message. Certainly do not, under any circumstances, attempt to contact anyone using the contact details that may have been provided within the message.

Most scam alerts are designed to scare the unwary into giving away sensitive information - or to fool you into doing something that you shouldn’t - usually to defraud you financially.

If you have reason to suspect that your iPad has a fault, you would be best advised to independently seek assistance directly from Apple Support. You can contact the Support Team using the Support link at top-right or bottom-left of this page.

Alternatively, you can initiate and manage your support cases from Apple devices using the excellent Apple Support App. If not already installed, the App can be downloaded from the App Store:

https://apps.apple.com/app/apple-support/id1130498044

You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to offer assistance:

Genius Bar Reservation and Apple Support Options - Apple

U. S. Federal Trade Commission – How To Spot, Avoid, and Report Tech Support Scams

"Tech support scammers may try to trick you with a pop-up window that appears on your computer screen. It might look like an error message from your operating system or antivirus software, and it might use logos from trusted companies or websites. The message in the window warns you about a security issue on your computer and tells you to call a phone number to get help.

…

If you get this kind of pop-up window on your computer, don’t call the number. Real security warnings and messages will never ask you to call a phone number."

I certainly would not recommend calling any phone number, or click on any link, included in the message that you saw. The phone number or link might deliver you directly into the hands of low-life scammers.

I recommend for you to make sure that this is not a scam or computer hacker before calling the number