Judging by your name, you are Swiss-based as well (IB is UK, I presume)…
When I try to buy VTRIX, it tells me that I need additional permissions. When try to request them, the only option I get under the “funds” section is “Non-US”. I have requested those (supposed to be processed within 24h) but I don’t think that will help as VTRIX is a US mutual fund.
All I could find on the forum so far were statements that non-US-based IB clients were not able to buy US mutual funds, hence my question (IB account setup - #3 by Peter)