for a few days I get an error within Mediaportal when I put the RSS link to trakt calendar.
If I insert the link into InfoService plugin of MediaPortal and click Save, I get this:
The url itself seems to work fine. Even I can see your RSS feed without credentials. Maybe they are blocking HTPC itself for some reason
If you need personal support it’s best to send a mail to support@trakt.tv or a DM to @support