Mary uses an ATEM Mini Pro to stream her podcast via YouTube Live. But recently, it stopped streaming from her camera. Leo says the ATEM is a great video switcher for the money. She found out that YouTube changes her streaming key from time to time. Leo says that Leo does that a lot. The key changes randomly. That's likely the issue.
YouTube does offer a permanent key, but Mary tried that and it didn't work. The solution may be to get her key just before she goes live, which can be a tedious thing from week to week.