Infinite Options only works with the Shopify Online Store sales channel.
Here is a quick reference for the most commonly asked about channels:
Sales Channel
Supported?
Online Store
Yes
Shopify POS
No
Shopify Collective
No
Shop App
No
Shopify POS Infinite Options custom option fields will not appear in the Shopify POS app for in-person sales. If you need to capture custom option information for in-person orders, we recommend collecting that information separately and adding it as an order note in Shopify POS.
Shopify Collective Infinite Options must be installed on the store where the product options are set up in order to display them. Because Shopify Collective sources products from another store, there is no way for Infinite Options to display or pass options across stores.
Shop App Infinite Options is not currently compatible with the Shop app. The Shop app does not support third-party apps at this time, so option fields will not be displayed to customers purchasing through it.