Hi robcraw,
You’re already off to a really good start. Those red Xs usually pop up when there’s something in the employee or super fund details that Pay Super can’t quite validate. The quickest way to track it down is to hover over each red X, as that should show a more specific message for each affected employee. This link has more info on troubleshooting super payments.
If it’s still not playing nice after that, the next step would be to recreate each super fund with a slightly different name, like adding NEW. Then relink it to your employees and give the payment another go. Once everything is updated, you can go ahead and remove the old super fund.
Cheers,
Princess