ECAS and MyCIC/GCKey are two separate systems. To see your application in MyCIC you have to link it to your profile first. If you have a representative they do this on your behalf and you will not have access to this system.
If you are not using a representative, you first have to create a GCKey login, then link your application in the MyCIC portal using your application number or UCI and personal details. This system gives a more detailed look at the process of the application than ECAS.
Note, calling IRCC's automated phone system and going through the options to check your application status will also play a recording of the same information that's displayed on MyCIC even if you don't have a linked account. Call 1-888-242-2100 from within Canada or using an online system, or from outside of Canada dial +1 (613) 944-4000, then select option 1 (for English) then 1-1 and you'll be put through to IRCC's menu.