I see that your form is inside a modal. Do you have your server connect, getCountries, set to load on the page or do you have the No Auto Load turned on?
If you have the No Auto Load turned on, then whatever button or link you have on the page will need to have a Dynamic Event > Click added to load the server connect when clicked. You would want to do this before the modal is shown. (You can ignore the “id” field in the image below if you do not have this set on your server action.)
If you do not have No Auto Load turned on, and you are not seeing the options, try saving the page and refreshing the page to see if the options appear.
Create a new modal and repeat the correct steps we did… (you will delete it after this test)
Do you have the options in the UI? Or it is empty again?