When mapping columns for Outreach Lookup Prospect, you need to use the exact column name from your Clay table that contains the work email. If you're using a Find Work Email waterfall, make sure to select the output column from that waterfall (likely named "validated work email" or similar) when mapping to the Email input field in Outreach.
If you encounter a "missing input" error, double-check that you're using the correct column name from your Clay table instead of a generic "email" column.
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