Sofia_Cruz
An invoice including the empleyer’s company address is only possible if both the company and you are registered with SBB Business Travel, as explained here:
https://business.sbb-tickets.cc/en/registration/registration-process/how-it-works.html
That shouldn’t be your own issue/problem, rather with your HR or finance department.
If you already bought the tickets as a private person, it should nevertheless be possible to claim the expenses (same as with e.g. taxi rides or meals). As mentioned by Krist above, the tickets (PDF) are the official expense evidence, as they include all relevant expense information such as your name, journey, costs, and even the VAT information for the tax refund.
