I sent a Resend Pending Membership Notice to the last two people that want to subscribe to my group, but neither had replied to the notice. I sent a personal email to the two individuals asking if they received the notice, and to date one replied telling me they did not receive the notice. .. What is happening here?
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My guess: spam folder.
In the pending list click on the person's row (anywhere except the checkbox). Then have a look at the "Email Delivery History" tab. That ought to tell you the fate of the messages.
If the messages were delivered by Groups.io then most likely the person just didn't see it. Whether it went to their spam folder or some other place would be up to their email service. If the delivery was unsuccessful that's something you could tell the would-be member, and have them report the three-digit failure code and message to their email tech support to find out why their service would not accept the message, and whether there's a way to "white list" Groups.io to ensure future deliveries.
If there's no record of the message(s) there, then I'd report that to [email protected]