I did send a webform to IRCC, it's going to take time.I believe those people attempted travel/booked tickets and were turned away by the airline or the border control. Anyways, it is not safe to book tickets with invalid counterfoil. Webform IRCC ASAP and ask what is the problem and for them to fix it/or what should you do in order to fix it. Mine shows that it is valid and same does for my husband (he received an exception to travel for family reunification)
Could you share me the email where you can get an authorization letter if you're eligible to travel?