I have been checking my status almost every day since Aug 18 with no luck. Checked tonight after not checking this week and was surprised to find the website and mobile app both show Platinum Premier.
I was a MR gold via united airlines status. Around April 2018 completed the Platinum challenge and have been a Platinum until tonight. So far this year I have 46 nights (31 nights from stays + 15 nights from having the chase marriott credit card).