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I’m not sure what your data looks like, but given Binning is failing because some of your values are objects, I suspect the safest thing to do would be to convert both values to strings with the onError block. So something like this:

	$cond: {
		if: {$eq: ["status", "failed to login"]},
		then: {$convert: {
			input: "$lastScraperStatus",
			to: "string",
			onError: "An error occurred",
			onNull: "Input was null or empty"
			}},
		else: {$convert: {
			input: "$status",
			to: "string",
			onError: "An error occurred",
			onNull: "Input was null or empty"
			}},
	}
}

In your original example you were using $first against lastScraperStatus; you may need to add that back in if it’s important.

LMK if this helps.
Tom