Giving a notice to vacate by email.

I live in BC. I notified my landlord by email on January 30th that I would be moving out on February 28th.
Until my landlord informed me by email today, on February 1st, that an RTB 51 must be signed for the email to have legal validity, I had no idea that such a form needed to be completed.

Questions:
- Do I have to comply with what this person is saying? Can I take legal action regarding this?
- Does an email also have legal validity when giving a notice to vacate? I heard from a lawyer that it does. I didn't know I had to sign a form for this.