I'm Miles from the Social Care team at Shopify. I would love to help you out with this, but I definitely need some more information in order to do so. Would you be able to reply to this thread with some more information?
Some quick troubleshooting steps I recommend are:
If the steps above don't work, I'll await your reply so I can help further. Thanks!
I'm having the same issue after uninstalling the FB app and trying to re-install it. I've signed out and signed back in (Shopify, FB etc.), tried different browsers and cleared my cache, but the error keeps appearing.
It keeps saying "There’s a problem connecting to Facebook. Try again soon."
This is likely relating to an open issue we have at the moment on Facebook's end. Facebook has advised us they have their devs working on a fix as we speak so I suggest trying again later.
In the meantime, please keep an eye on our status page as we will provide live updates there.
If you have any ongoing issues after the fix is implemented, please let our live support team know. Thanks!