Sometimes simply signing out of the app and then signing back in can restore missing channels by refreshing the link back to your account.
Doesn't always work, but worth a try before getting the Forum Team involved.
Edit to add: Although the Sky sports channels should show in the VM TV Go app you do need to use the Sky Sports app to view them. Normally the TV Go app will invite you to exit the app and launch the Sky Sports app for you.
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GrahamI'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media, I'm a VM customer. There are no guarantees that my advice will work. Learn more
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