According to HTC, my Amaze 4G is fully ready from the factory to be queried for its identifier tolken, but when I run the appropriate command, it doesn't work. I get:
$ fastboot oem get_identifier_token ... (bootloader) [ERR] Command error !!! OKAY [ 0.010s] finished. total time: 0.010s $
Note that someone reported the same problem, but their phone requires updating firmware and running "RUU". You can read about that here.
Same problem, different cause. Note that I did update the SDK prior to trying run fastboot - I wonder if I shouldn't have!
It's worth mentioning that I called HTC and asked for help and they were of no particular assistance; "You know more about it than I do." "How do I report a bug on fastboot?" (No useful reply to that!)