In my case any attempt to access the group results in a monition to the effect that 'You must be a member....' --- whereas joining the group requires that I have a Yahoo Acct -- which leads to firm insistence upon a 'mobile number' --- FWIW (likely very little) I blame the legions of Facebook minions whose mindless acquiescence enabled/mainstreamed abolition of online privacyI have been a Yahoo Groups member forever. I still receive email digests from several groups I track, but haven't explicitly logged in for a year or so. I just tried it, and it asked for the mobile number, which I left blank. It said my login "failed", but yet I can still access the groups I could previously...
Best regards
HP