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Jan. 8, 2019
7:16 p.m.
Resolution for me:
I changed the api_key (in mailman-hyperkitty.cfg) and SECRET_ARCHIVER_KEY (in the Django local settings file) to something new, rather than using the original string that came with the settings file. I don't know if one of the characters in the original string is a no-no in my server environment (Ubuntu), or if a non-printing character was hiding in there, or WHAT, but...it works now!