Im am missing pms colour 2311c in my Pantone+ Solid Coated Swatches.
How can I find or maybe update my pantone colours?
I'm not entirely certain you're in the correct forum (which product are you referring to) but this is the forum for the mobile app Adobe Illustrator Draw.
If that's an older color, you may have to reload that library from an older version.
Something you'll want to do in Adobe Illustrator:
Once you've gotten the colors that you're happy with, create a new swatch library in your CreativeCloud Libraries, and sync it.
The next time you sync Adobe Draw, the colors will be available in your custom library. (You may need to switch libraries at the bottom of the color picker screen: see attached)
Colors from CC Libraries shared with Illustrator: