Yeah, when you invite someone. Whether the email gets out or not, they have a created account, so as admin you just change their password. IIRC, you go to their new user card, and navigate to Account->Details on the gear menu. Any admin can do this to reset any account pw manually at any time.

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Same goes for requests, once you approve it, manually change it. Probably to a dummy one that you encourage the user to change themselves.