Apps On The Move

I am getting the error(s) shown below when attempting to sync to my nextcloud instance

• The credentials I am using have all permissions
• I am using a lets encrypt cert but have tried the allow untrusted option and get the same result
• I have tried adding /org to the url (https://example.com/remote.php/dav/files/joey/org) and that directory does exist on the server)

Based on googling the error message it seems to be related to the certificate. This article does say to make sure the time is correct on each device. Does this mean that they both need to be in the same timezone or just the minutes and seconds need to be in sync? The server is setup for UTC and I would prefer not to change that. Could that be the cause?   

09:16:48 Creating WebDAV client: {
rootURL = "https://example.com/remote.php/dav/files/joey/";
}
09:16:48 WebDAV listing request started
09:16:48 Starting WebDAV request: {
request = "<NSMutableURLRequest: 0x2824a6210>{ URL: https://example.com/remote.php/dav/files/joey/org }";
}
09:17:41 WebDAV request failed: {
error = "Error Domain=NSURLErrorDomain Code=-1012 \"(null)\" UserInfo={NSErrorFailingURLStringKey=https://example.com/remote.php/dav/files/joey/org, NSErrorFailingURLKey=https://example.com/remote.php/dav/files/joey/org}";
}
09:17:41 WebDAV request failed: {
error = "Error Domain=com.saemobile.LEOWebDAV.error Code=-1 \"(null)\"";
}
09:17:41 Sync completed: {
conflicts = (
);
error = "Error Domain=NSURLErrorDomain Code=-1012 \"A list of your files couldn't be downloaded from your server. Check that your WebDAV server URL, username and password are correct.\" UserInfo={NSLocalizedDescription=A list of your files couldn't be downloaded from your server. Check that your WebDAV server URL, username and password are correct.}";