I'm having the same issue with my new Galaxy S20 FE 5G, but the problem showed up when I last updated the phone (to One UI 3.1, I think). Before that my third party fast wireless charger worked fine. This is utterly unfair, I bought the charger after making sure it was compatible with the fast wireless charging of my phone.
So is it confirmed that the feature has been disabled purposely by Samsung?
How can I report the issue and complain about it? Directly to Samsung I mean, since I would like to have a confirmation of the intent of the anti-competitive and harming consumers behaviour, before reporting it to the competent authority.
Today my Galaxy S20 FE updated to One UI 3.1 and since then, the 3rd partry QI charger can't fast charge the phone. I receive a notification which says it's incompatible, and only slow wireless charging is possible.
As this was working fine before the update, and also works with my Note 10+ (which has not received One UI 3.1 yet), I can confirm that the incompatibility was made up by Samsung 😞 I think is not a software bug as this limitation is getting widely distributet with updates to multiple Samsung models with the latest One UI update.
It'd worth a class-action lawsuit in the US or other bigger markets to force Samsung to revert this change.
Also it's againts the QI open standard, so Samsung should not be allowed to use QI logo or name anymore.