i use their website a lot, to put books into collections. But I usually don't check for the book (on my kindle) for several days. So I don't know whether it's normally slow --- but it always works.
PS to get to "manage content & devices" I just hover over the "Hello MyName, Account & LIsts" button. "Manage content & Devices" is in the right column, 2 lines below a noticably longer line. (Well, that's how I usually find it!)
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