We are an entirely on-premise organization without any cloud or *365 accounts or apps, and it has to stay that way. I have an Exchange 2019 server with OWA (or whatever it's called now) working fine. The one thing I can't seem to figure out is how to get shared calendars to show up in Outlook Mobile for either IOS or Android. There's some mention of it only working for O365 accounts. I can see the shared calendars from OWA and desktop Outlook fine.
How can I access shared calendars from a mobile device without any 365 accounts?