Is a husband permitted to force his wife to remove her niqab after he had agreed to her condition of wearing it before marriage?

It is not permissible for the husband to force his wife to remove her niqab in front of non-mahram men, even if she did not stipulate this in the marriage contract. Nor is it permissible for a woman to remove her niqab in front of non-mahram men, even if her husband agrees, because covering the face is an obligatory command in Islamic law, and this obligation is further confirmed by the husband's command to do so.