Perhaps you can request something from Service Canada..?
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My suggestion is to contact the liveaboard you have booked with direct, or if you used a travel agent, they may be able to assist. I have not had any divers experiencing issues to date.What is contact to apply for waiver and send documents .does it need to be done in advance , or can you present documentation when boarding. I am unable to navigate CONANPP to find out any info. Thanks