There are a few possibilities:
You are using a third party checkout app for checkouts.
Customers are using Express Checkout (G-Pay, PayPal, Apple Pay, etc.)
Upsell+ is not compatible with the items listed above.
There are a few possibilities. a) You are using a third party checkout app for checkouts. b) Customers are using Express Checkout
There are a few possibilities:
You are using a third party checkout app for checkouts.
Customers are using Express Checkout (G-Pay, PayPal, Apple Pay, etc.)
Upsell+ is not compatible with the items listed above.