Are there any limitations on variant options?
There are 2 limitations on variant options due to the way Facebook Messenger works.
For products, each variant has a limit of 13 options. So if a product comes in more than 13 colors, for example, the app will only display the first 13 as choices for your commenter to choose from:
One more limitation in the product variant options is the name of the option. Facebook has a limit of 20 characters for the buttons. So long option names can get cut off like this: