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I'm just posting this here as I don't like to upload the data to the solutions part of things

This should work if you're having trouble creating or updating a SharePoint list item column item to a null value.

This has been seen over a variety of column types.

Answer follows in a second.

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This should get what you need, feel free to replace GetById with GetByName and use the list name (I just know that I change mine a lot ).

Send an HTTP request to SharePoint

Create a Send an HTTP request to SharePoint action as a POST in your flow:

URI - _api/web/lists/GetById('YOUR_LIST_ID')/items(ITEM_ID)
Headers - code follows list - You need Content-Type, Accept, IF-MATCH, and X-HTTP-Method, headers.
Body - code follows list - Clarify the '__metadata' 'type' to "SP.Data.LIST_NAMEListItem" (where LIST_NAME is case sensitive, with a capitalised first letter), then list any fields (case sensitive) that you'd like to make null, and set the value to null.

The only caveat is that you may need to ensure that you have the right type if you're doing cleverer things with your SharePoint list.

URI

_api/web/lists/GetById('YOUR_LIST_ID')/items(ITEM_ID)

Header JSON

{
 "Content-Type": "application/json;odata=verbose",
 "Accept": "application/json;odata=verbose",
 "IF-MATCH": "*",
 "X-HTTP-Method": "MERGE"
}

Body JSON

{
	"__metadata": {
		"type": "SP.Data.LIST_NAMEListItem"
	},
	"YOUR_LIST_COLUMN_NAME": null
}

LIST_NAME is the exact name of the list, case sensitive, but *always* capitalise the first letter.
YOUR_LIST_COLUMN_NAME is exactly the case sensitive to the list column.