Hey I have ipad air 2

There are no Memojis or Animojis for older iPads.

Older iPads lack the Face ID, true depth cameras.

Also, Memoji and Animoji Stickers, for iPads that can run iPadOS, requires an iPad that has an A9 CPU or greater.

The iPad Air 2 and iPad Mini 4 models ONLY have A8X and A8 CPUs, respectively, and are ineligible from getting the Memoji Sticker feature of iPadOS.

For very good, third party Memoji apps for yout iPad model, I recommend either Emoji Me or Your Avatar Creator.

Sorry & Good Luck to You!

Memoji is not available on your iPad, because it doesn't support True Depth or Face ID.

To use an animated Memoji, you need a compatible iPhone or iPad Pro.

source: Use Memoji on your iPhone or iPad Pro - Apple Support