There is an action to add (and remove) a label from an email; however, there isn’t a good explanation of what is expected in the “Message to be labeled” field. What is the syntax this field is looking for?
Best answer
Gmail Action: Add Label to Email - ?
Best answer by Troy Tessalone
Hi
The ‘Message to be Labeled’ field expected the Gmail Message ID.
TIP: You can determined the expected value for a dropdown field by viewing the available options, which tends to be a unique system ID (but not always) shown as the smaller gray value underneath the friendly value.
Example

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