The symptom of having linked the wrong account
This is common when someone has both an email login and a wallet login on Polymarket.
Polycopy shows a zero balance while Polymarket shows money
You connected an account with no funds in it. Disconnect and connect the funded one.
Your positions in Polycopy do not match Polymarket
You are looking at two different accounts. Compare the wallet address in Polycopy Settings against the address on your Polymarket profile.
Copies keep failing for insufficient balance on a funded account
Same cause, unless your cash is genuinely low. Check Cash vs Portfolio Value first, because that one is more common.