August review for Facebook & Instagram

I am unable to connect Facebook & Instagram app to my Shopify store. I have tried it several times for over a week, but it is repeatedly showing an error message. I am being billed monthly, but I am unable to use the sales channel to sell products. it's so disappointing and discouraging!! The support is equally pathetic. I have no idea what the issue is because nothing is being pointed out, except that an error occurred.