For whatever it's worth, we solved the same problem (mine had the error code associated with an RCN email address) two ways. First, more time did do the trick. ?But, at more than an hour or two, I'm still a little surprised it would take that long to work its way through groups.io. ?I'd guess it should be much more immediate than that? ?Separately, had the subscribing member use another, more mainstream email address and that invite was received in about 15-20 minutes.
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I'm not sure what to think but, for whatever reason, there's some slowness with invites and email addresses confirmed as valid and responsive outside the groups.io platform?
