I'm perhaps more familiar with the situation in New Brunswick. In some regions in the northern part of the province, and even in the Moncton area, French is the main language of work in some federal departments. For example, I worked at Fisheries and Oceans Canada's head office in Moncton when I was a student, and I spoke French most of the time. I'm also the chair of UNI Financial Cooperation, which is a credit union that operates in French, since it is subject to the Bank Act.
On February 12th, 2024. See this statement in context.