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| Subject: Invitation to join the <groupname>@groups.io email group
Shouldn't this be "<groupname>.groups.io"? (and again in the message body)?

Mark typically uses the group's posting address as the name of the group, so it should appear as [email protected] or <[email protected]>. That is, the angle brackets should either encompass both the name and domain, or not be present.

It would seem logical to refer to the group by its URL rather than its posting address, unless a group permits non-subscribers to post, clicking on the posting address shouldn’t take anyone to the group website… And until an Invitation were accepted one would not be a subscriber yet, unless clicking on that <posting address named group> both accepts and generates a message to the group - I would think it is more likely that a new subscribe would rather go to the group upon joining rather than immediately sending a message to the group.

however at the bottom of the Invitation there were 3 confusing and unexplained 'buttons':
"Thank you for the invite." , "Thank you for the invitation." , and "Can you please add me?"
What are these 3 unexplained 'buttons', what is the difference between them, and where do they go?

That sounds like a feature of your email interface. I know Gmail sometimes makes suggestions like that, what they do is compose a reply with the suggested text in the body, then leave it for you to complete the reply or just click Send. Possibly other services have that feature too.

Yes it was to an outlook.com email address (as I quoted in my inquiry)
| Hello <emailaddress>@outlook.com,

Thanks for the explanations.