I think there are a few reports like this… e.g., [3.4.0.24][4.0.1.48] CalDav sync with Nextcloud server fails
It does seem like if you don’t have Nextcloud in its own domain, SFOS doesn’t like it.
SFOS also doesn’t have all the hacks that other programs implement to work around well known directories, so it always pays to run Nextcloud’s security check, which identifies these issues.
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