I love LOOKUPVALUE. It’s a great DAX function.
However, sometimes, it’s better for the column to be looked up in Power Query.
To bring in a column from another table, Merge your lookup table with your main table on the common key.
Here’s an example where I bring in the State Name into a table. I’m ‘looking up’ using a state abbreviation column.
Step 1: Merge Queries to bring in desired column.

Step 2: Merge. I’m Doing a Right outer join on the State Code Column to get my State Name.
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