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While deauthorizing a single-use license, an error is returned during the deauthorization process:
Error: "7466: Deauthorization of the license is denied because max number of returns is exceeded."
The ArcGIS Desktop 10 Single-Use License has been deauthorized more than four times within the year. The year starts on the date of the first deauthorization. Single-Use License Types are limited to 4 deauthorizations per year.
Please contact Esri Technical Support, Customer Service, or your local ESRI distributor.