When I initiate the joining process (with a dummy but valid) address, the resulting web page https://kent-eng.groups.io/g/all-Kent/joined says :
Look for a message from Groups.io with the Subject: "Confirm Your Groups.io Account"
However, the message received actually has the subject line:
[KEN] Confirm your join-ken-eng@... email address
Can these please agree with each other?
Malcolm Austen <malcolm.austen@...>