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Thomas Markov
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The Two Weapon Fighting bonus action attack requires that you take the Attack action, attack with a light melee weapon, and you are holding a light melee weapon in each hand.

The rules for Two Weapon Fighting state:

When you take the Attack action and attack with a light melee weapon that you're holding in one hand, you can use a bonus action to attack with a different light melee weapon that you're holding in the other hand. You don't add your ability modifier to the damage of the bonus attack, unless that modifier is negative.

The Bladesinger's Extra Attack feature reads:

You can attack twice, instead of once, whenever you take the Attack action on your turn. Moreover, you can cast one of your cantrips in place of one of those attacks.

So when you do (attack + cantrip), you are taking the attack action and the first attack is with a light melee weapon. Therefore, you would qualify for the bonus action attack from Two Weapon Fighting, if you are holding a light melee weapon in each hand.

This is a problem. As discussed in this Q&A, you must be holding the second weapon when you take the first attack: Can you benefit from the Dueling fighting style for one weapon, then draw a second weapon as part of Extra Attack to qualify for Two-Weapon Fighting?

This means that for this combo to work, we must be holding two light melee weapons at the beginning of the attack action. Since Somatic components require a free hand, we are now limited to casting a cantrip that does not have Somatic components. Fortunately, there are three such damaging cantrips on the Wizard spell list:

  • Lightning Lure
  • Mind Sliver
  • Sword Burst

Assuming we cast one of the three cantrips above, and are holding two short swords, the following turn is valid:

  1. Take first attack of Attack action with short sword
  2. Use second attack of attack action to cast Sword Burst
  3. Two Weapon Fighting bonus action attack with short sword.
Thomas Markov
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