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It doesn't work for a couple reasons:

The multiclassing rules outright make Thirsting Blade not do anything if you already have the Extra Attack feature (emphasis mine):

Extra Attack

 

If you gain the Extra Attack class feature from more than one class, the features don't add together. You can't make more than two attacks with this feature unless it says you do (as the fighter's version of Extra Attack does). Similarly, the warlock's eldritch invocation Thirsting Blade doesn't give you additional attacks if you also have Extra Attack.

(Multiclassing rules from the Basic Rules)

Also, the offhand attack from two-weapon fighting is a separate bonus action, not part of the main Attack action (possibly helpful tangential reading: What does upper-case-A-Attack action vs. lower-case-a-attack mean?). Thirsting Blade specifically says that when taking the Attack action, you can replace one attack with your pact weapon with two instead. The offhand attack is not part of that Attack action, and in your example, you're not making any attacks with the pact weapon as part of the Attack action to trigger Thirsting Blade.

It doesn't work for a couple reasons:

The multiclassing rules outright make Thirsting Blade not do anything if you already have the Extra Attack feature (emphasis mine):

Extra Attack

 

If you gain the Extra Attack class feature from more than one class, the features don't add together. You can't make more than two attacks with this feature unless it says you do (as the fighter's version of Extra Attack does). Similarly, the warlock's eldritch invocation Thirsting Blade doesn't give you additional attacks if you also have Extra Attack.

(Multiclassing rules from the Basic Rules)

Also, the offhand attack from two-weapon fighting is a separate bonus action, not part of the main Attack action (possibly helpful tangential reading: What does upper-case-A-Attack action vs. lower-case-a-attack mean?). Thirsting Blade specifically says that when taking the Attack action, you can replace one attack with your pact weapon with two instead. The offhand attack is not part of that Attack action, and in your example, you're not making any attacks with the pact weapon as part of the Attack action to trigger Thirsting Blade.

It doesn't work for a couple reasons:

The multiclassing rules outright make Thirsting Blade not do anything if you already have the Extra Attack feature (emphasis mine):

Extra Attack

If you gain the Extra Attack class feature from more than one class, the features don't add together. You can't make more than two attacks with this feature unless it says you do (as the fighter's version of Extra Attack does). Similarly, the warlock's eldritch invocation Thirsting Blade doesn't give you additional attacks if you also have Extra Attack.

(Multiclassing rules from the Basic Rules)

Also, the offhand attack from two-weapon fighting is a separate bonus action, not part of the main Attack action (possibly helpful tangential reading: What does upper-case-A-Attack action vs. lower-case-a-attack mean?). Thirsting Blade specifically says that when taking the Attack action, you can replace one attack with your pact weapon with two instead. The offhand attack is not part of that Attack action, and in your example, you're not making any attacks with the pact weapon as part of the Attack action to trigger Thirsting Blade.

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CTWind
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It doesn't work for a couple reasons:

The multiclassing rules outright make Thirsting Blade not do anything if you already have the Extra Attack feature (emphasis mine):

Extra Attack

If you gain the Extra Attack class feature from more than one class, the features don't add together. You can't make more than two attacks with this feature unless it says you do (as the fighter's version of Extra Attack does). Similarly, the warlock's eldritch invocation Thirsting Blade doesn't give you additional attacks if you also have Extra Attack.

(Multiclassing rules from the Basic Rules)

Also, the offhand attack from two-weapon fighting is a separate bonus action, not part of the main Attack action (possibly helpful tangential reading: What does upper-case-A-Attack action vs. lower-case-a-attack mean?). Thirsting Blade specifically says that when taking the Attack action, you can replace one attack with your pact weapon with two instead. The offhand attack is not part of that Attack action, and in your example, you're not making any attacks with the pact weapon as part of the Attack action to trigger Thirsting Blade.