What to Do If Mining Is Running but You're Not Earning ROCC

After you start mining, the device first has to download and verify the chain. Until that sync completes there are no rewards; the wallet screen shows its stages.

If the sync is done but you see no rewards in the operations list, they are most likely just hidden: clear the Hide mining reward checkbox in the wallet and they will appear.

The size and frequency of rewards depend on the network and on how much traffic went through your node; running the VPN increases your reward coefficient.