I am afraid this will be very hard to fix. Pantheon Notify uses a Clutter.Text object to store the notification text. Clutter.Text admits Pango markup, which seems not to support the "href" tag (https://developer.gnome.org/pango/unstable/PangoMarkupFormat.html).
If you ever saw hyperlinks working in a Gtk.Label, it's because Gtk.Label admits "href" tags in addition to Pango markup.
I am afraid this will be very hard to fix. Pantheon Notify uses a Clutter.Text object to store the notification text. Clutter.Text admits Pango markup, which seems not to support the "href" tag (https:/ /developer. gnome.org/ pango/unstable/ PangoMarkupForm at.html).
If you ever saw hyperlinks working in a Gtk.Label, it's because Gtk.Label admits "href" tags in addition to Pango markup.