Hi Jonasgp,
are you logged under your Epic Games account also in the application? You can check it, when you click on the question mark, which is in the upper right corner of the application window. In you click on it, there in the Active user field should be mentioned epic.
If you are not under the Epic Games account, you can sign in follow these steps: https://support.capturingreality.com/hc/en-us/articles/360020684099-Cannot-export-my-model-in-PPI-mode-after-migrating-to-Epic-games-account