Apple Watch Series 5 no longer has Microsoft Teams as an available app
I have a Series 5 watch. Last year I had a Microsoft Teams app on my watch where I could read messages, respond with voice to text and even make and take calls. The app was deleted off my watch by accident (life with toddlers!). I still get notifications but I can't do anything further to view, respond or call.
I have tried to reinstall it but it looks to no longer be available. After a quick google it's suggested that it works in the Series 6 watch. What I don't understand is if it was previously working on the Series 5 watch, why has it now been removed as a compatible app??
Apple Watch Series 5