Major Update:
I just got a letter via email from CPC Mississauga (I'm based in Toronto if that matters). I missed the IMM5406 Additional Family Information form.
I realized that I missed the form last week Friday June 14. I don't know how I missed it but I realized that I did when I read a message here about an applicant not adding her sister and I wondered what the hell they were talking about. Imagine, I went through the forms and checklist over and over and still missed a form. Unbelievable.
Anyway, I sent IMM5406 via web form on Saturday June 15. Of course I didn't say anything on the forum because I didn't feel like being lambasted for mailing my application days after getting ITA (got it on April 24 and they received the application package on April 30) and then missing something. But I decided to share because the letter has a couple points of clarification.
Today, June 21 at 4:04 PM EDT, I got an email from CE CSC Do Not Reply confirming that they got the form and they'll forward it.
Also today June 21 at 7:09 PM EDT, I got the letter from CIC.CPCMississaugaDoNotReply saying that they don't have the form.
"
If you cannot provide one or more of the requested documents, you must provide a detailed written explanation for each missing document. You must also provide any other evidence or documents you have available to satisfy the requirement." This is pretty standard IRCC wording but the parts below
"You have 30 calendar days from the date of this letter to submit the documentation requested. When you submit your documentation, please ensure that this letter is included in the package. If your application meets the requirements for processing, it will then be placed in the processing queue based on the date on which you submitted an application that was determined to be complete."
further down the letter says
"If you fail to respond to this request within the timeframe specified above, your application will be returned to you. Your sponsorship application, and any related permanent residence application, will not be processed or be put in queue for processing under the PGP cap for 2019. You will not be issued another invitation to apply."
This whole process has been excruciating for me. There are nights when I didn't sleep because I thought I made a mistake. I started a new job on Monday April 29 and didn't sleep on the Sunday or Monday nights due to anxiety over the application.
There's a lot more about this application that I will share when it's all over. Let's see what happens.