You can't appeal directly to the IAD like you can with an outland app, but you can request a Judicial Review at the Federal level.
See here:
https://www.canada.ca/content/dam/ircc/migration/ircc/english/resources/manuals/enf/enf06-eng.pdf
5.4. Notification to persons of their right to appeal or file an application for judicial review
Where no statutory right of appeal exists, or those rights have been exhausted, there is a right to seek judicial review with respect to any matter arising from the application of the IRPA by filing an application for leave and judicial review to the Federal Court pursuant to subsection A72(1).
Also here:
https://www.canada.ca/en/immigratio...eps/refusal-options/federal-court-review.html
Review by the Federal Court is a two-stage process. In the first stage, which is known as the “leave” stage, the Court reviews the documents related to your case. You must show the Court that an error was made in the decision, or the decision was not fair or reasonable.
If leave is given, this means the Court has agreed to examine the decision in depth. At this second stage, called “application for judicial review,” you and your lawyer can attend an oral hearing before the Court and explain why you believe the original decision was wrong.
From what I've heard, vast majority of rejected cases that request judicial review, are not successful since they basically require you to show an error in law was made by the visa officer. However I don't know the history of all cases. Hiring an experienced lawyer is mandatory.
Another option to appeal directly to IAD, is to simply re-submit a new outland application immediately, and when that one is also rejected for same reason you can then appeal it through IAD.