What is the ruling of Islamic law regarding the divorce of a woman who filed a lawsuit for divorce against her husband on the grounds of harm and absence, provided a fictitious address for him, and obtained a divorce ruling in absentia without his knowledge? And what is the expiation for that?

If your deception in providing an incorrect address influenced the judge's divorce ruling, you have committed a grave sin that requires repentance. Despite the judge's ruling, you are still your husband's wife, because a judge's ruling does not make lawful what Allah has forbidden, especially if it was based on false information or perjured testimony. Therefore, you must return to your husband and ask for his forgiveness.