JR, this will sound crazy, but the old OS cannot access iCloud. That is where the problem lies.
As the OS ages, the browsers that will work aren¡¯t accepted at various web sites for security and certificate reasons. Even if the site updates its certificates, the browser doesn¡¯t recognize them. You can work around that for a while, but eventually they fail. I fought this battle for a couple of years.
Brent
On my iPhone Xr
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On May 23, 2024, at 07:52, JR via groups.io <Yahoo_jr@...> wrote:
?My old Macs and iPads, iPhones are all running BusyCal app instead of Apple's Calendar app, and they've been working fine since installation years ago.
The iOs devices all sync to iCloud and to my Macs; iPads sync via WiFi.
To access iCloud with BusyCal one has to generate an Application Password after signing in to iCloud and using that password to access the iCloud-based calendars.
You can also publish your personal calendars from your host machine and then have (anyone) subscribe to those calendars on their own devices.
My 2?...