That address is the RHF ERC-20 on Robinhood Chain, chain 4663. This explorer indexes RobinhoodFork, chain 42019, where nothing is deployed at that address, which is why the page is empty.

On this chain RHF is the native gas token. There is no contract to look up and nothing to add as a custom token: add the network and your balance appears on its own. To hold the ERC-20 instead, import that address in your wallet while it is on Robinhood Chain.