For those who received their AORs, keep in mind that the UCI number on your AOR is for the Sponsor only. However, the Application Number is the same for both of you.
The PA has a different set of 8 digit UCI number (should be the same one on their original Entry Visa/Study/Work Permit).
For MyCIC, use the PA's GCKey and information to link your application because it is the PA who is applying for Permanent Residency, not the Sponsor.
For eCAS, use the Sponsor's information because the Sponsor gets processed and needs to get approved first. The PA's Permanent Residency will be processed afterwards. Plus, Sponsor's eCAS will provide status information for both.
On the number of family members when you are linking your app to MyCIC, enter 2 if it's just the Sponsor and PA. Add 1 for every dependent regardless of they are accompanying the PA or not.
For Outlanders, follow the same instruction above, and make sure the intended Province and City to live when the PA lands are the same one as on your application, not the Port of Entry.
Do not enter any space between your Application Number and UCI number. If you Passport Number is AB_12345 then it needs to be PA12345. No space between the letters and numbers! Same with the App and UCI Numbers.
If any of it doesn't help and if you had someone else filled in your app, get the copy of your app and check it thoroughly for small errors.