Is it permissible to share a commission between an employee and one of the two partners, without the knowledge of the other partner, if the commission resulted from work outside the agreed-upon scope of the institution?

The employee is an agent for his employer, and it is not permissible for him to take the permissible commission except with the employer's permission. If the company is owned by two or more individuals, the right to the commission belongs to both of them jointly, and it is not permissible for one of them to take it without the knowledge of his partner, unless there is an agreement between them that stipulates otherwise.