@Annika-Backstrom Thanks for the update. Glad that it now works for you. The changes will be contained in the next DAVx⁵ release.
DAVdroid fail to connect to URL containing "~"
Try connect to https://example.com/~user/owncloud/remote.php/caldav/
“HTTP error: 403 Forbidden”
No problems to connect using desktop browser.
Duplicate of #80.
Please see also Why tilde (~) should not be used in Web addresses (URLs).