When did hamlet offer ophelia a chance to align with him and to tell the truth?

Rather than Ophelia, it was Gertrude that Hamlet tried to persuade to align with him and tell the truth about the death of the king. This scene can be found in Act III scene iv of the play "Hamlet" by William Shakespeare.

Explanation:

Hamlet did not approach or ask Ophelia to align with him and tell the truth. Rather, it was his mother Queen Gertrude that he approached to change her ways and tell the truth to everyone.

Act III scene iv shows the scene where Queen Gertrude had called Hamlet for a private audience with her to reprimand him about his act of aggravating the King. Hamlet had organised a performance of a play where the very deeds of a younger brother killing his elder brother for the kingship were shown. Gertrude wanted Hamlet to apologize to his step father/uncle, the now king Claudius. In this scene, Hamlet pleads with her to change her ways, reveal the truth and become the lady she was before she married Claudius. This scene also ended in the accidental death of Polonius, Ophelia's father.

It was Gertrude that he wanted and offered a chance to align with him. Ophelia was the woman he loved who turned insane after the death of her father.