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I haven't even had my Discover IT card for a month yet, but I added my fiancee as an AU when I filled out the application and verified with Discover that she was added when our cards arrived. Discover is reporting on my credit reports already but not on hers. Whether that means they're not reporting her as an AU, or they just haven't done so yet I don't know.
my discover reports to DW as long as the AU lives in the same address it will report to all 3 agencies