This is what the CFL Rule Book says:
Quote:
If Team B legally gains possession during an unsuccessful convert attempt (i.e. interception of forward pass, recovery of fumble or blocked kick), it may score two points by advancing the ball across Team A’s Goal Line. If the play terminates with Team B in possession in its own Goal Area or in the Field of Play, there shall be no score.
If the play terminates with Team A legally in possession in Team B’s Goal Area, Team A shall be awarded two points if the ball had been carried or passed across the line of scrimmage, but no points if the ball had been kicked across the line of scrimmage.
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It doesn't specifically address this situation, but it seems like it would be zero points.