I had multiple failures like that on a 2020 upgrade recently and found it was the rights of the user running the Adv service. If I ran it in MAS90 mode, the conversion went fine.
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Beth Bowers
Mom to Samson, Peanut, ChiChi, Canton, Cagney and Daisy (NO Oxford comma - shriek!)
Tennessee Software Solutions
269-445-1625
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