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Please pay attention to the error message:

ImportError: cannot import name AddTWoIntsResponse

notice how it says: AddTWoIntsResponse.

The name of your service is AddTwoInts. The name of the service response type would be AddTwoIntsResponse.

Both are with a lower-case w. You wrote it with an uppercase W:

from service_node.srv import AddTwoInts,AddTWoIntsResponse

Just as in your previous question (#q380524) such details are important. Capitalisation of characters matters, as w is different from W.

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