• Per MSDN:

    KEY INDEX index_name

    Is the name of the unique key index on table_name. The KEY INDEX must be a unique, single-key, non-nullable column. Select the smallest unique key index for the full-text unique key. For the best performance, we recommend an integer data type for the full-text key.

    It has to be single-key. That means one column. Can't be compound.

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