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I can't get Lightning to sync with my Horde Calendar hosted at Bluehost

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I'm using Horde 5.2.22 hosted at Bluehost and Thunderbird 60.6.1 with Lightning 6.2.6.1 I try the URL posted in Horde and also the URL for a secure SSL/TLS connection provided in the Calendar tab of the Bluehost Cpanel. When I use the URL from the Horde webmail app for Caldav Subscription the calendar is greyed out and will not "turn on " and I get this error

Lightning:[calCachedCalendar] replay action failed: null, uri=http://webmail.cpanel-box5824.bluehost.com/rpc/calendars/ben@correctconnection.tech/calendar:ff0dc1e5-9889-e580-1f55-1492de60a613/, result=2147500037, operation=[xpconnect wrapped calIOperation]

When I use the URL from the Bluehost Cpanel the Calendar appears with a little warning symbol and I get this error message

Lightning:"There has been an error reading data for calendar: Master. However, this error is believed to be minor, so the program will attempt to continue. Error code: DAV_DAV_NOT_CALDAV. Description: The resource at https://mail.correctconnection.tech:2080/ is a DAV collection but not a CalDAV calendar" calCalendarManager.js:984 Lightning:There has been an error reading data for calendar: Master. However, this error is believed to be minor, so the program will attempt to continue. Error code: READ_FAILED. Description: calCalendarManager.js:984 Lightning:[calCachedCalendar] replay action failed: null, uri=https://mail.correctconnection.tech:2080/, result=2147500037, operation=[xpconnect wrapped calIOperation] calCachedCalendar.js:330 Lightning:"There has been an error reading data for calendar: Master. However, this error is believed to be minor, so the program will attempt to continue. Error code: DAV_DAV_NOT_CALDAV. Description: The resource at https://mail.correctconnection.tech:2080/ is a DAV collection but not a CalDAV calendar" calCalendarManager.js:984 Lightning:There has been an error reading data for calendar: Master. However, this error is believed to be minor, so the program will attempt to continue. Error code: READ_FAILED. Description: calCalendarManager.js:984 Lightning:[calCachedCalendar] replay action failed: null, uri=https://mail.correctconnection.tech:2080/, result=2147500037, operation=[xpconnect wrapped calIOperation]

I'm using Horde 5.2.22 hosted at Bluehost and Thunderbird 60.6.1 with Lightning 6.2.6.1 I try the URL posted in Horde and also the URL for a secure SSL/TLS connection provided in the Calendar tab of the Bluehost Cpanel. When I use the URL from the Horde webmail app for Caldav Subscription the calendar is greyed out and will not "turn on " and I get this error Lightning:[calCachedCalendar] replay action failed: null, uri=http://webmail.cpanel-box5824.bluehost.com/rpc/calendars/ben@correctconnection.tech/calendar:ff0dc1e5-9889-e580-1f55-1492de60a613/, result=2147500037, operation=[xpconnect wrapped calIOperation] When I use the URL from the Bluehost Cpanel the Calendar appears with a little warning symbol and I get this error message Lightning:"There has been an error reading data for calendar: Master. However, this error is believed to be minor, so the program will attempt to continue. Error code: DAV_DAV_NOT_CALDAV. Description: The resource at https://mail.correctconnection.tech:2080/ is a DAV collection but not a CalDAV calendar" calCalendarManager.js:984 Lightning:There has been an error reading data for calendar: Master. However, this error is believed to be minor, so the program will attempt to continue. Error code: READ_FAILED. Description: calCalendarManager.js:984 Lightning:[calCachedCalendar] replay action failed: null, uri=https://mail.correctconnection.tech:2080/, result=2147500037, operation=[xpconnect wrapped calIOperation] calCachedCalendar.js:330 Lightning:"There has been an error reading data for calendar: Master. However, this error is believed to be minor, so the program will attempt to continue. Error code: DAV_DAV_NOT_CALDAV. Description: The resource at https://mail.correctconnection.tech:2080/ is a DAV collection but not a CalDAV calendar" calCalendarManager.js:984 Lightning:There has been an error reading data for calendar: Master. However, this error is believed to be minor, so the program will attempt to continue. Error code: READ_FAILED. Description: calCalendarManager.js:984 Lightning:[calCachedCalendar] replay action failed: null, uri=https://mail.correctconnection.tech:2080/, result=2147500037, operation=[xpconnect wrapped calIOperation]

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I didn't exactly figure this out, but I cleared all accounts and saved passwords, and with that done I added the Calendar, then Contacts, then e-mail and everything seems to be working as expected.