Upgrading old sandbox app for Clover Flex

Hi,

I'm trying to upgrade an old application developed before the Flex was created. I went to the Manage apk on my dev (sandbox) dashboard, then checked the clover Flex checkbox.

I have a subscription plan for that particular app, and it's available for my merchant group (Register merchants), but still, it's not listed in the App Store

Has anyone had that kind of issue?

Thanks