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How were you able to track the 4th application for which AOR is not received?
I guess because in this case the application was actually registered by the agent, it appeared in the system.
So what I did:
1. I tried to link it in gckey but using options without the application number, because I didn't have it.
It was successfully located and linked on the same day of AOR for others. At this point I had the application number and should be now receiving updates for it to the email as well. (if the reason for missing AOR was wrongly typed email address)
2. On the next day, I checked ecas, and the application appeared there without any action on my end. Ecas is only updating on next business day morning, so be patient. I already used it for other applications (using UCI as identifier), so didn't have to try different options of identifiers, etc.