I hadn't yet as Apple support had not responded, as they promised by mail. However, your link provided a way to get through by phone directly (took about three minutes) and an Apple support person resolved things. Thanks.
ryck
"What Were Once Vices Are Now Habits" The Doobie Brothers
iMac (Retina 5K, 27", 2020), 3.8 GHz 8 Core Intel Core i7, 8GB RAM, 2667 MHz DDR4
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Canon Pixma TR 8520 Printer
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