XML : Live Tile not updating

So I'm attempting to pin a secondary live tile, which gets pinned perfectly well, but it stays completely static. None of my xml shows up. This is my code:

      public static async Task PinSecondaryLiveTile1(string backdrop, string poster, string name, string description, string param, Color color)      {          string rawxml = @"  <tile>      <visual branding='name'>          <binding template='TileSmall'>              <image placement='peek' src='%POSTER%' />              <image  hint-overlay='60' placement='background' src='%BACKDROP%' />              <text hint-style='caption' hint-wrap='true' hint-align='center'>%TITLE%</text>          </binding>          <binding template='TileMedium'>              <image placement='peek' src='%POSTER%' />              <text hint-style='body' hint-wrap='true'>%TITLE%</text>              <text hint-style='captionSubtle' hint-wrap='true'>%DESCRIPTION%</text>              <image hint-overlay='60' placement='background' src='%BACKDROP%' />          </binding>          <binding template='TileWide'>              <group>                  <subgroup hint-weight='25'>                      <image src='%POSTER%' />                  </subgroup>                  <subgroup hint-weight='75'>                      <text hint-style='body' hint-wrap='true'>%TITLE%</text>                      <text hint-style='captionSubtle' hint-wrap='true'>%DESCRIPTION%</text>                  </subgroup>                  <subgroup >                      <image hint-overlay='60' placement='background' src='%BACKDROP%' />                  </subgroup>              </group>          </binding>          <binding template='TileLarge'>              <image src='%POSTER%' placement='peek' />              <text hint-style='title' hint-wrap='true'>%TITLE%</text>              <text hint-style='captionSubtle' hint-wrap='true'>%DESCRIPTION%</text>              <image hint-overlay='60' placement='background' src='%BACKDROP%' />          </binding>      </visual>  </tile>";          rawxml = rawxml.Replace("%POSTER%", poster).Replace("%TITLE%", name).Replace("%BACKDROP%", backdrop).Replace("%DESCRIPTION%", description);          XmlDocument xml = new XmlDocument();          xml.LoadXml(rawxml);          Debug.WriteLine(rawxml);          SecondaryTile secondaryTile = new SecondaryTile();          secondaryTile.Arguments = "Movie=" + param;          secondaryTile.DisplayName = "The Index";          secondaryTile.Logo = new Uri("ms-appx:///Assets/Square150x150Logo.scale-150.png");          secondaryTile.TileId = "Movie=" + param;          secondaryTile.TileOptions = TileOptions.ShowNameOnLogo;          secondaryTile.VisualElements.ShowNameOnSquare150x150Logo = true;          secondaryTile.VisualElements.ShowNameOnSquare310x310Logo = true;          secondaryTile.VisualElements.ShowNameOnWide310x150Logo = true;          secondaryTile.VisualElements.Square150x150Logo = new Uri("ms-appx:///Assets/Square150x150Logo.scale-150.png");          secondaryTile.VisualElements.Wide310x150Logo = new Uri("ms-appx:///Assets/Square310x150Logo.scale-150.png");          secondaryTile.VisualElements.Square310x310Logo = new Uri("ms-appx:///Assets/Square310x310Logo.scale-150.png");          secondaryTile.WideLogo = new Uri("ms-appx:///Assets/Square310x150Logo.scale-150.png");          secondaryTile.BackgroundColor = color;            await secondaryTile.RequestCreateAsync();          TileUpdateManager.CreateTileUpdaterForSecondaryTile("Movie=" + param).Update(new TileNotification(xml));      }    

This is an example of the data I would pass:

backdrop="http://image.tmdb.org/t/p/w300/hNXfIPwexOpZXmOww6ewoihMcfN.jpg"

poster="http://image.tmdb.org/t/p/w92/6K5JOW6HmrwJnP0VILq667cspnS.jpg"

description="2016 • Science Fiction, Action, Crime, Drama • 144min"

param="5468"

Any idea what the issue is?