PAC 2021 checker is giving me a set of errors when I am trying to get my PDF to be AODA Compliant.

Hi I am working on a set of PDFs. I need to make sure they are AODA compliant. Post editing on Acrobat, I am trying to validate them using PAC 2021. It's giving me the following errors. 

1) Invalid use of "Reference" structure elements. [Though I am using it where actually it's a link redirecting us to a web link, since I read it somewhere, I have enclosed <Link> inside <Reference> tag and <Reference> inside <P> tags. But, still this error exists.]

2) Invalid use of "Form" structure elements. [The PDF contains a form. Initially I got an error the the Form Fields are not tagged. Now when I have tagged them, it's giving me this error.]

3) Invalid use of "Figure" structure elements. [The structure is like (Paragraph - Figure - Paragraph) -> When I tagged the first and the last ones as a Paragraph, it still gave me error. Now, when I have tagged it as a <Figure>, it still gives me this error.]

Any help would be highly appreciated. I have tried a number of ways to figure out, but somehow I have not been able to get the solution to any of this. 

Thanks,

Kapil