Is avoiding direct involvement with usury in working for a mixed government bank sufficient to legitimize the salary, or is it necessary to transfer to Islamic branches or departments, and what is the ruling on the money earned so far if the work is deemed unlawful?

What was earned from a usurious transaction before knowing its prohibition is permissible to benefit from, based on the Almighty's saying: "So whoever receives an admonition from his Lord and desists, he may have what has already passed, and his affair is to Allah." As for working in the administration of government employees' salary transfers without any connection to usurious contracts, there is no harm in it. The wife's work in deposits and withdrawals might involve calculating or paying interest, and for this reason, it becomes unlawful. However, what has no relation to usury in a government bank is permissible.