HI
My situation is exactly the same as yours, and we received the first PAL letter on October 11 and the second letter on December 3. Regarding the first letter, I am sure that the first PAL letter will be sent after eligibility, and I cannot comment on the second PAL letter exactly. It is very important to remember that everyone should receive these two PAL letters, and it seems that this letter is issued to all members of the group after the security of the last person who is approved.
Therefore, the dates of the notes and letters sent should be like this: the first PAL letter after eligibility approval with a maximum interval of 24 hours, and the second PAL letter is a reminder PAL letter that is issued to everyone after the last person is approved. Of course, it is important that to confirm this theory, all members of the group should receive the officer note.