Hey mate, it's been a few years since I've worked with Exchange but my experience is wide and varied and I'm sure I can give this a good crack and get it resolved. I can also jump on today to take a look. Would be good to understand the overall architecture including any load balancers, other exchange servers etc... Although that's something I can check after getting remote access. Feel free to ping me to discuss further. Disclaimer, if you need zoom sessions and needing to shadow me whilst I work I'm not interested and all the best!
P.S. Climate change could be real ?