Given that lions are from Africa did people in Europe even know what a real lion looked like? Were they imported for something like royal menageries or something similar? Or was it all based on old stories from when they were imported during Roman times?
This question comes up often here, at least for England, but the answer should be generally the same for other European coats of arms.
There is a section of the FAQ about it, and u/jschooltiger also wrote about it: Why does England have a Lion on their flag, despite the fact there were no Lions in England?, with links to numerous other older answers.