Went to Wyndham's status match page (https://help.wyndhamrewards.com/s/status-match?language=en_US) and uploaded a screenshot of my IHG profile showing my name, status and account number. Received an email within 2 days updating my Wyndham status to Diamond for 90 days, with the possibility of extending it until the end of the following calendar year by staying 10 nights within the 90-day period.