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My purchased train ticket is not showing as a route anymore! What do I do?

I purchased my online ticket from Frankfurt Flughafen Fern. to depart at 11:58am change in Manz Hbf and arrive in Freiburg(Breisgau) Hbf at 14:53 all on December 22....however, this route is no longer showing as an option. What do I do?