Number of arguments does not match for aggregate function COUNT

I am creating a LookML dashboard which requires some measures that are calculating a COUNT_DISTINCT on two fields from a table. From my understanding, COUNT_DISTINCT should be able to take in 2 arguments but I keep getting the error that is attached. I have reached out to Looker Support numerous times but they do not seem to have an answer. They have created test measures using 2 fields as arguments in COUNT_DISTINCT but did not have any issues. Has anyone else run into this problem?
Screenshot 2023-06-30 at 4.22.54 PM.pngScreenshot 2023-06-30 at 4.20.24 PM.pngScreenshot 2023-06-30 at 4.23.44 PM.png

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