Why is it that I have Avast Premium but when I hit the resolve button to it says I need to purchase Avast Premium to clear up the scan findings?
It rather depends on what needs to be resolved ?
It may be a function not included in the Avast Premium product.
https://www.avast.com/en-gb/premium-security
This though is seen more in the Avast Free product as an inducement to purchase additional paid products.
Presumably this is after you ran a Smart Scan (or was it something else) ?