When I was at the Council of Ministers of Education, Canada, there was a lot of talk about the recognition of prior learning and qualifications. They even said they were going to make sure that any qualified person would be able to get into a classroom. On the one hand, there is often opposition from professional bodies as to who should be admitted to the profession. On the other hand, there are people who come from abroad to teach.
However, it would be important for these people to receive training on the context in which they are going to find themselves and work. For example, if you come from France and settle in Ponteix, Saskatchewan, the environment is not the same; the context is different. It's also important to understand that the pedagogical approaches used in Canada are not necessarily the same everywhere. It's a matter of adaptation. So we have to give those people the tools to succeed. Without the proper tools, they won't succeed in the classroom.
Just because you're a teacher in one country doesn't mean you can automatically transfer your knowledge to another. The teacher always needs to understand the cultural aspect of their classroom. You know as well as I do that, in today's classrooms, there are a lot of different needs, not to mention neurodiversity. We have to be aware of all that, which requires some training. The community that welcomes teachers from immigrant backgrounds must be made aware of this.