I ran into the same issue and wrote a solution found at the link below:
https://www.delasign.com/blog/xcode-store-kit-fix-finance-authentication-error
Please note that the solution described above resolves this issue, and also resolves 2 other errors that could arise:
[Default] Error enumerating all current transactions: Error Domain=ASDErrorDomain Code=509 "No active account" UserInfo={storefront-country-code=USA, client-environment-type=Sandbox, AMSServerErrorCode=0, NSLocalizedDescription=No active account}
[StoreKit] Did not receive any products or error for products request