In the Netherlands, magic mushroom therapy is illegal. Since 2008, the sale and possession of psilocybin-containing mushrooms are prohibited, so guided sessions with mushrooms are not permitted.
Magic truffles (sclerotia) are legal to buy and possess, and guided truffle sessions are allowed only as non-medical coaching. They take place outside regular mental healthcare, providers cannot make medical claims, and psilocybin cannot be prescribed except in licensed clinical research.
For background on the legal debate and arguments for change, see this article. I hope this helps.