ECAS won't show an update until about 24 hours after receiving the AOR email AFAIK. Your partner will be able to see some update on ECAS in a day (or two). It will say "Application Received". The "In Process" status will come at a later date.Interestingly, my partner received AOR yesterday for online application (Jan 31). The new dashboard says "in-progress" for all items. ECAS (old system), says "file not found" (may not be in progress yet). So, does one conclude that the application is 'in-progess' or not?
Also, congratulatons on your oath invite, Raj! You deserve such miracles (rejection on UP, then invite)!
And thank you, yes, the UP request being denied first and then being approved was indeed a miracle.