Quick note to say that the EWG is aware of the situation, and is starting to discuss with people at Microsoft about how to manage the transition in the best way for OSM.
For timeline, the original announcement gives a end date of June 30, 2028 for those with enterprise plan. Martin Raifer thinks this is the plan our keys are issued under; but we are confirming. It’s a few years away, but we should wait to get a transition plan in place asap.