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I was able to create my account with the application number and track the status.
I have my application as In progress (as well as language skills, physical presence, background verification and prohibitions).

But in the old ecas, I am not yet able to see anything
 
I was able to create my account with the application number and track the status.
I have my application as In progress (as well as language skills, physical presence, background verification and prohibitions).

But in the old ecas, I am not yet able to see anything
Same here!
 
I was able to create my account with the application number and track the status.
I have my application as In progress (as well as language skills, physical presence, background verification and prohibitions).

But in the old ecas, I am not yet able to see anything
I have seen some online applicants that had issues accessing the information in ECAS, I think they called IRCC and they helped to link the application.