Julie here from Shopify Support.
Thanks for the screenshot! Based on what I'm seeing, it looks like you are currently using the Facebook Shop sales channel, which has since been delisted from the Shopify App Store and replaced by the new Facebook channel.
This is likely the reason why you are receiving this error message, and to maintain an integration between Facebook and Shopify, you'll just need to install the new Facebook channel here. Once installed, I recommend reviewing our help documentation on setting up the Facebook channel.
Unlike the previous Facebook Shop sales channel, the new Facebook channel combines Facebook Shop, Instagram, and Facebook Marketing all within a single application. This means that you can use the Facebook channel to sync your products to a catalog on Facebook and Instagram, and even create marketing activities directly from Shopify. The new channel provides merchants with a more streamlined and user-friendly experience and you can learn more about its features from our official announcement here.
I hope this clears things up, but let me know if you have any questions about transition!