Do I need to have Apple Air Play to use sidecar?

Here is Apple’s support page that details the required Mac and iPad specifications for Sidecar:

https://support.apple.com/en-gb/HT210380#systemrequirements

Info about Sidecar - Use your iPad as a second display for your Mac with Sidecar – Apple Support

Yes you do and there are certain requirements from both the Mac and Ipad to be able to use sidecar, which is listed in the above link

Thanks

That takes you to change your ID Lotus

Corrected. Tks.