Even if you have not met residency obligation, if you are in Canada, Appeal should help, as inspite of not meeting Residency obligations, IRB Member will consider other parameters also, like unusual difficulties / best interest of child involved etc.
Even if you are not in Canada, but you missed residency only by a few days, then you should try that still, and in the appeal, you should request to attend the Appeal in person, giving more credibility and positive intent to your request for H&C considerations. ONe reference,
Emodi v Canada (Citizenship and Immigration),
2019
But, if you are short of the requirement by a long one, maybe difficult..review this link
Ramnath v Canada (Citizenship and Immigration),
2019
Valladares v Canada (Citizenship and Immigration),
2019
I am not a legal expert...take it as another opinion!