I saw what you did that trades start on 4PM of the new NFL year but also saw that Stafford was traded on Jan 30 last year so it appears LouisEly is correct. I think it just can't be submitted until the new year as is what happened with Stafford. I found this from the link below, looks like you have 8 hours after the start of the new year to submit transactions which is how the Packers would get the trade in before the cap deadline: March 16: The 2022 League Year and Free Agency period begins at 4:00 p.m., New York time. Clubs will receive a Personnel Notice that will include all transactions submitted to the League office during the period between 4:00 p.m., New York time, and 11:59:59 p.m., New York time, on March 16. The trading period for 2022 begins at 4:00 p.m., New York time, after the expiration of all 2021 contracts. https://www.si.com/nfl/giants/news/2022-key-nfl-off-season-dates-announced#:~:text=Clubs%20will%20receive%20a%20Personnel,expiration%20of%20all%202021%20contracts.