Authorisation letter was sent to me via an email. However, Gc-key wasn't updated by them.(must be some technical error). So I was not allowed to board a flight on October 18, which I shared in this forum. After contacting IRCC they rectified that error and informed me through email. I checked in Gc-key account, it was showing application approved and new details were attached to my passport. But still had doubts, however took a chance to go since, no other thing was showing pending. My advice to persons receiving an AL, just don't go straightaway, let your new details get reflected in your Gc-key account .