Hi fxm8166,
Thank you for posting in Apple Support Communities! From our understanding, you are unable to charge your iPhone 12 wirelessly on your Morphie Powerstation Plus XL charging pad but you're able to charge with another wireless charging station and with a wired connection, is that right?
Sounds like we can isolate this to the Morphie charging station based on the information provided. Are you able to charge another device wirelessly using that Morphie charging station? Have you also removed any protective case from your iPhone 12 to ensure that's not hindering the connection to the charging station?
Is this the one you're using: powerstation plus XL wireless with PD? If so, this device is compatible with AirPods, iPhone 11 Pro Max, iPhone 11 Pro, iPhone 11, iPhone Xs Max, iPhone Xs, iPhone XR, iPhone X, and USB-A Devices, according to the official site. It doesn't seem like it may be compatible to wirelessly charge your iPhone 12.
Hope that help!