Upvote:1
The Nexus grace period only comes into force if a renewal request is filed before the date of expiration. See the first CBP quote in the answer to this question. It says:
If you submitted a renewal application before expiration of your current membership, then you can continue to use your benefits until the renewal is finalized (up to 6 months after your expiration date).
The six-month period has subsequently been increased to twelve months:
Due to a significant increase in application volume, we are extending the grace period from 6 months to 1 year for any submitted renewal application. This means you will continue to receive full benefits for 1 year while U.S. Customs and Border Protection is finalizing your renewal application.β¦
With thanks to @Jason for the previous answer.