facebook wont let me connect my business manager

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Hey guys sorry to panic but i need help, im supposed to start running ads of FB today and i cant connect my FB business account with shopify, i connected my personal FB account, but then when i try and connect it with a business manager it says "business manger connect failed try again" i tried deleting the app from shopify and reinstalling it, i did it on an incognito browser. i signed out of FB and logged back in...please help