@Philipp Diendorfer , From your description, it seems we are deploying Adobe Reaeder DC via Intune Win32 app. it seems the user needs x64 version and you want to uninstall the x32 version. But the uninstall is failed. If there's any misunderstanding, feel free to let us know.
To uninstall the app via Intunw win32 uninstall assignment, we need to firstly ensure the uninstall command we configured in Intune win32 can works silently. Here, please choose one device and run the uninstall command manually on the device to see if it can be uninstalled silently without user interaction.
Please try the above suggestion and if there's any update, feel free to let us know.
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