Please make sure that both the online wallet and wallet holding the 10,000 PIV for staking are both running the latest software and updated to the latest block. Out-of-date software and forked blockchains are a common cause.
When a masternode first starts, it has to operate for a time to qualify for rewards. The qualifying time is approximately three days.
You should move the rewards with care to avoid disrupting the masternode configuration. If you are committing 10,000 PIV using a Ledger hardware wallet, you can use the SPMT tool (made by PIVX developers) to claim the rewards.