Just received this email for a bonvoy silver member (through credit card):
as a Marriott Bonvoy™ Silver Elite member, you can enjoy elevated benefits when you also join MileagePlus.

I did not receive such email yet despite being LP. I checked the forum and web and did not see any recent announcements, what did I miss?
EDIT: just got my email too

PS of course the links in the email do no work at the moment:
fly-united.marriott.com took too long to respond.
HTTP ERROR 504