If you’re looking to update something with a null value (meaning you remove what’s currently there) that’s not something that is possible via Zapier. Some apps have functions that you can use that tells the app you want to delete the value, but I haven’t seen that very often. You could overwrite it with something like a period, or see if adding a space does it (I'm not confident it will).
Adding a space is worth a try, I'll give that a try
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