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If you don't see both discounts, try adding code PROTECTSUBSCRIBER (Thanks to Ppatel334 for the info)and that should add one of the two. I don't know if it'll add one discount if you don't have any, or if it'll add 20% if all you have is 10%.
It worked for me, within Costco 1-year and have been signed up for Plus protection to come up in a little over a month.