What Specific Data Must a Miner Include in the Block Header of a PoA Template?

A PoA miner must include standard block header data such as the previous block's hash, the Merkle root of the transactions included, a timestamp, and the difficulty target. Crucially, they must also include a 'nonce' (number used once) which is the value they are solving for in the PoW phase.

This nonce, combined with the other data, must result in a hash that meets the difficulty requirement.