Is a divorce that took place under duress, and with the wife's prior knowledge of what her relatives would do, considered a religiously and legally valid divorce, especially after the issuance of the divorce certificate?

Allah commanded the husband to treat his wife with kindness and warned against oppressing her. You must repent to Allah for your mistreatment of your wife. Regarding the divorce, you did not clarify how your wife’s maternal cousins coerced you, as coercion is not merely insistence or threats, but rather when there is a strong presumption of severe harm, such as murder or severe beating. For coercion to be valid, the coercer must be capable, there must be a strong presumption that the threat will be carried out, and the harm must be significant, such as murder or severe beating. If you were coerced into divorce, then the divorce is not legally binding, but the divorce document must be annulled. However, if coercion was not established, then the divorce is binding. If the divorce occurred before consummation or valid seclusion, it is an irrevocable divorce over which you have no right of return. If you wish to remarry her, a new contract and dowry are required. It is preferable to present this matter to trusted scholars in your country.