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?That's very peculiar. I'll guess that it is either som?ething trivial (the member is putting an incorrect URL into iCab) or something very deeply wrong? with his network stack. More likely the former.

To have any hope of guessing what the problem is we'd need more information, such as what he means by "cannot join". Does this mean that he can't access Groups.io at all (but the rest of the web is fine)? Or does this mean that he gets this error at some point while attempting to use the Groups.io sign-up page? Or does it mean something else?

A screen-shot of the error might be a good place to start, but step-by-step info on what the member is trying to do will still be helpful.

?Shal?