For what it’s worth, the WebDAVNav Server logs shows the following.
2022/05/30 14:41:48:831 Error 401 - Unauthorized (/Dave/)
2022/05/30 14:41:48:842 Request: PROPFIND /Dave/
2022/05/30 14:41:48:847 Response status: 207 Length: 1053
2022/05/30 14:41:48:930 Error 401 - Unauthorized (/Dave/)
This suggests that the PROPFIND actually worked, but the next request gets a 401 response, and Enpass fails to reauthenticate.