That requirement is separate from The Family Property Act, which governs how the proceeds are divided once a sale happens. Consent to sell and entitlement to the money are two different questions, and both spouses are involved in each.
A lawyer handling the closing, typically for $800 to $1,500 in legal fees, will confirm both signatures are on file before title transfers through Information Services Corporation, so a missing signature surfaces well before possession day rather than after.
A hand-reviewed valuation from Joel Dyck, agreed before either spouse signs, is usually what makes getting both signatures straightforward. Get your hand-reviewed valuation from Joel Dyck.