if it's embedded in another service and you already clicked join etc. through that other service to name one UX flow where an additional pre-join dialog would be not supper wanted

I e.g. would not complain if MS Teams (I have to use for work) would not put me into a pre join dialog every time I click join in Outlook but just joins me with mic muted/camera disabled by default. But then it also wouldn't be a security issue in my case as I put MS Teams and co. into it's own browser window/process/profile (not due to concerns but more as a side effect of them refusing to even trying to work on Firefox and not wanting to miss out on the tab sync + tab group + account container and not being allowed to install arbitrary extensions which add similar functionality to chrome).