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Yes, a fighter gets their extra attack when using action surge

Action surge gives you an extra action on your turn:

On Your Turnyour turn, you can take one additional action on top of your regular action and a possible Bonus Actionbonus action.

There is no restriction on what this action can be used for. Using it to take the Attack action would indeed then trigger Extra Attack since that feature triggers:

whenever you take the Attack action on Your Turnyour turn.

Is it powerful? Of course. But this is what fighter are good at: swinging weapons many times for high damage.

Yes, a fighter gets their extra attack when using action surge

Action surge gives you an extra action on your turn:

On Your Turn, you can take one additional action on top of your regular action and a possible Bonus Action.

There is no restriction on what this action can be used for. Using it to take the Attack action would indeed then trigger Extra Attack since that feature triggers:

whenever you take the Attack action on Your Turn.

Is it powerful? Of course. But this is what fighter are good at: swinging weapons many times for high damage.

Yes, a fighter gets their extra attack when using action surge

Action surge gives you an extra action on your turn:

On your turn, you can take one additional action on top of your regular action and a possible bonus action.

There is no restriction on what this action can be used for. Using it to take the Attack action would indeed then trigger Extra Attack since that feature triggers:

whenever you take the Attack action on your turn.

Is it powerful? Of course. But this is what fighter are good at: swinging weapons many times for high damage.

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source | link

Yes, a fighter gets their extra attack when using action surge

Action surge gives you an extra action on your turn:

On Your Turn, you can take one additional action on top of your regular action and a possible Bonus Action.

There is no restriction on what this action can be used for. Using it to take the Attack action would indeed then trigger Extra Attack since that feature triggers:

whenever you take the Attack action on Your Turn.

Is it powerful? Of course. But this is what fighter are good at: swinging weapons many times for high damage.