[Ethereum] Rinkeby testnet with Opensea metadata not showing

I suspect this is just a rounding problem. MetaMask doesn't show enough decimal places. The account that created the token has a balance of 0.000000000000001.

The token has been created with 18 decimal places, so it takes a balance of 10^18 token units to equal one token. If you want to have 1000 tokens, you need to pass in 1000 * 10^18 (a 1 with 21 zeroes after it).

It seems like my setContractURI function had one encodepacket too much. it looks like it is working now on OpenSea.

    function setContractURI(string memory contractURI_) public onlyOwner() {
        _contractURI = string(abi.encodePacked(
                "data:application/json;base64,",
                Base64.encode(
                    bytes(
                        contractURI_
                    )
                )
            ));
    }