I create a wallet with private keys disabled.

Then use importmulti like so:

command curl --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "importmulti", "params":[[{ "scriptPubKey": { "address": "bcrt1qeappehxje9d46zjeyvh3cqslzzda9p92nx2xg495e8memcjvppvqhk6hcn" }, "label": "Imported Address", "timestamp": "now", "watchonly": true, "keypool": true, "internal": false }], ''{"rescan": false}''] }' -H 'content-type: text/plain;' http://user:password@127.0.0.1:18443/wallet/Test
result = Optional({
    error = "<null>";
    id = curltest;
    result =     (
                {
            success = 1;
        }
    );
})

But when I run getnewaddress it says keypool empty:

curl --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getnewaddress", "params":["", "bech32"] }' -H 'content-type: text/plain;' http://user:password@127.0.0.1:18443/wallet/Test
result = Optional({
    error =     {
        code = "-4";
        message = "Error: This wallet has no available keys";
    };
    id = curltest;
    result = "<null>";
})

This also happens when I use importmulti descriptor approach to import a multisig.

I am trying to create a watch-only wallet for my multisig, where the only key that is in the keypool is the multisig address, just to make building transactions with the wallet seamless.