Charge/Fuel flap sticking has been an issue across the whole VW group for several years, it’s not just the Enyaq that suffers with it.
Best advice seems to be give the actuator a light spray with a silicon lubricant every 4 months or so. WD make one, just don’t use WD40!
https://www.wd40.com/products/silicone-lubricant/
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!