Question

If you all agree with the solution, where we should alert when the string output from both machines are not identical, let me know.

Is "where" miss placed there? Should I use "when" twice?

Answer 1

Sounds a little weird but it sounds better than with 'when' twice.

Answer 2

Maybe just change it to

If you all agree with the solution, we should alert when the string output from both machines are not identical, let me know.

I agree that you should change it to when but it also makes sense with where out of the sentence :)