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Cheap beans will act very differently and it’ll be hard to dial in as you might not be able to make a nice coffee from them at all! Buying a kg of espresso beans from YB is a good way to go. Reasonably priced and it’s worthwhile just getting practise at dialling shots in. You’ll waste way more coffee otherwise.
If it’s a light roast, it may be tricky to dial in anyway!
Also, I take it you are weighing the beans. Right?
Yes coffee not coming through at all. Suspect grind is too fine but need to get some cheap beans to trial different grinds rather than waste the fancy ones gifted by a friend.