Here's the webdav debug log when connecting via win10. Maybe I was wrong on it working before, I had tried multiple workstations. I will include a debug log with a linux client connecting in a bit:
---------------WIN10
2021/07/09 16:47:42 DEBUG : Using config file from "/home/user/.rclone.conf"
2021/07/09 16:47:42 DEBUG : rclone: Version "v1.55.1" starting with parameters ["rclone" "serve" "webdav" "local:/home/user" "--user" "Gfish" "--pass" "****" "--cert" "/home/user/davcert/webdav.crt" "--key" "/home/user/davcert/webdav.key" "--addr" ":14789" "--log-file=webdav.log" "--log-level" "DEBUG"]
2021/07/09 16:47:42 DEBUG : Creating backend with remote "local:/home/user"
2021/07/09 16:47:42 DEBUG : fs cache: renaming cache item "local:/home/user" to be canonical "/home/user"
2021/07/09 16:47:42 INFO : Local file system at /home/user: poll-interval is not supported by this remote
2021/07/09 16:47:42 INFO : Using --user Gfish --pass XXXX as authenticated user
2021/07/09 16:47:42 NOTICE: Local file system at /home/user: WebDav Server started on https://[::]:14789/
2021/07/09 16:49:19 http2: server: error reading preface from client 23.123.222.112:50184: read tcp 185.207.177.12:14789->23.123.222.112:50184: read: connection reset by peer
2021/07/09 16:49:20 http2: server: error reading preface from client 23.123.222.112:50185: read tcp 185.207.177.12:14789->23.123.222.112:50185: read: connection reset by peer
2021/07/09 16:49:20 http2: server: error reading preface from client 23.123.222.112:50186: read tcp 185.207.177.12:14789->23.123.222.112:50186: read: connection reset by peer
2021/07/09 16:49:21 http2: server: error reading preface from client 23.123.222.112:50187: read tcp 185.207.177.12:14789->23.123.222.112:50187: read: connection reset by peer
2021/07/09 16:49:21 http2: server: error reading preface from client 23.123.222.112:50188: read tcp 185.207.177.12:14789->23.123.222.112:50188: read: connection reset by peer
2021/07/09 16:49:22 http2: server: error reading preface from client 23.123.222.112:50189: read tcp 185.207.177.12:14789->23.123.222.112:50189: read: connection reset by peer
2021/07/09 16:49:22 http: TLS handshake error from 23.123.222.112:50190: EOF