This thread has been really helpful I really appreciate everyone's posts, so I wanted to share my datapoints on the Nexus renewals for the family. All of our Nexus memberships were set to expire on various dates 2024. So heeding the advice of many on here, we applied for renewal at approximately a year prior to expiration of each. Here's the timeline:

June 19, 2023: P1, P2, P3 - Renewal submitted
August 7, 2023: P4 - Renewal submitted
October 8, 2023: P1, P2 - Receive a letter placed into account indicating approval (no interview required) with new expiration date of 2029.
October 10, 2023: P3 - Receives letter placed into account indicating approval (no interview required) with new expiration date of 2029.
November 17, 2023: P4 - Receives letter placed into account indicating approval (no interview required) with new expiration date of 2029
November 22, 2023: P4 - Receives Letter with new Nexus card in US mail. Online account had a button to click, to acknowledge receipt of the card which was done.

So the big issue is that P1, P2, and P3 never received their new Nexus cards in the mail. Not only that, there was no button to click in each of their accounts to acknowledge receipt of their cards. Almost as if something broke in the process of getting the cards distributed. In early November I opened up a help desk ticket as suggested by some posters on here, but received a generic email response with some FAQ's as a response. It did say to respond to that email if the FAQ's don't help (which I then did), but that was several weeks ago and no further response was received.

Went to the Nexus office at YYZ last week, they checked all accounts and said everything is in order on the Canadian side. They indicated that the actual printing of the cards is handled on the American side and gave me a phone number to call in the US (with a warning that the wait times can be very long. That number is 1-877-227-5511. I'm told they are open from 8:30am-5:00pm ET.

I called that customer service number today 12/20/23, and after about a 10 minute wait I spoke to a representative. She indicated that there were problems with getting Nexus cards sent out on some accounts at the end of September and early October of this year. She was able to assist me with escalating a case to get this resolved. However, she could only help in cases where it was for myself or a minor dependent. Due to privacy rules, anyone over 18 would need to call them separately and provide their information.

So, we have escalations open with them now, and I will report back if there is any movement on the case.