@j-ed - YES, you are correct. My phone was on my public (no password) wifi that has no access to the LAN that is password protected. It was designed to keep visitors out of my stuff.
And it worked - it kept me out of my stuff.
Thanks for seeing what should have been obvious to me!
DAVx⁵ does not recognize Webcal subscription if the calendar name contains umlauts
(Just coming here to report a small, low-importance bug since there is no bug tracker.)
For Webcal calendar subscriptions, DAVx⁵ defers to ICSx⁵ to do the actual subscription, but Webcal calendars are also shown with a check mark in DAVx⁵ to indicate the subscription status. However, this does not seem to work if the calendar name contains umlauts, such as this one (“Sun (München)”):
Tapping the check box in DAVx⁵, everything works fine at first, i. e. ICSx⁵ opens and the subscription can be created without any problems. However, after completion, DAVx⁵ still shows an empty check box for the problematic Webcal calendar. The box can be tapped again and ICSx⁵ will happily let you create a duplicate subscription for the very same calendar URL, but the calendar will always remain unchecked in DAVx⁵.
I can confirm this. Reason: ICSx⁵ store the URL with UTF-8 %-encoded “ü”, while DAVx⁵ looks for subscribed URLs with “ü”.
Should be fixed with 2.5