Cant create a connection due to duplicate values

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I have a problem, where I can't create a connection between two columns of two tables. It says one of the columns should have unique values. It should, I made sure I queried distinct values. I trimmed the data, I also changed everything to lowercase. I even went ahead and used remove duplicates in PowerQuery (when I selected all the columns and even on the single column). The problem still exists and I can't create a connection.

Does anyone have any tips?



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