Invoking either the ribbon action or command: “Open today’s daily note” returns “Error: File name cannot contain any of the following characters: \ / :”
If you look in Settings > Core plugins - Daily notes, is there anything custom in the data format/new file location/template location that might have a prohibited character (depends on OS)?
To comply fully with ISO8601: Combined date and time and also to comply with only legal characters, you could use YYYYMMDD[T]HHmm as the date format. Or if you are little more lenient, you could skip the T and use something else, like a space, [ ], or a dash/minus, [-].
Last I checked (and I haven’t tested in a while) this technically works, but isn’t supported well. So the navigation hotkeys no longer work. Which isn’t a deal-breaker, but inconvenient. (If this has changed, please let me know.)