Scammed

My husband literally thinks he’s getting close to 500,000 from this email. But before he can get it he has to pay them 900, which doesn’t make sense but he believes it real. And the sad part is , he’s actually going to give them the money. The people are from Africa. Apparently he’s done his research on the company. Oh and apparently he has two days to give them the money or there locking it for another month. I married a dummy. Does anyone know what banque credit union is??