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lonelinesslab,

User B, although they are an owner and I can see there are not bounced
where I their member profile, is not receiving these notifications.

When you look there, if a message is listed in the "Most Recent Successful Delivery" panel then you know that the member's email service accepted the message. After that, whether it goes to the person's Inbox, Spam, Trash, or a black hole is entirely up to that service to decide.

Some email services may greylist messages from groups.io, in which case you'll see messages listed in the "Most Recent Unsuccessful Attempt" panel.


But after a reasonable period of time (several days) if a message doesn't appear in the Recent Bounces panel then it is reasonably safe to assume that it was accepted by the email service.

Is anyone able to point me in the direction of how/ where I can
troubleshoot this issue?

The most likely issue, given that the messages aren't bouncing, is that they are being delivered to User B's Spam folder. He/she will have to figure out how to correct that or work with it.

Apart from telling user B what to look for (above), I'm not sure there's anything you can do. It is possible that User B's corporate domain is not a suitable service to use with Groups.io (if they have policies that blackhole such messages) or it is possible that User B can contact the corporate IT department to resolve the problem.

Shal


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