There are 3 conditions for "supercharging" to work.
1 Smartphone that is compatible and set up for.
2 The right cable for your smartphone.
3 Suitable power supply for your smartphone.
If 1 of the 3 is not taken into account, it will not work.
I myself had the same type of problem and my cable was theoretically compatible but apparently it was either faulty or not compatible with my smartphone because I just took another cable and then it worked.
In your case, if you have the option, it's to change your power supply and/or the cable to see if it would work...
VoLTE, Samsung Pay and Wi-Fi calls do not work in some cases with the EU version.
See note on Digitec for product: Samsung Galaxy S20 FE 5G EU (128 GB, Cloud Navy, 6.50 ", Hybrid Dual SIM, 12 Mpx, 5G)
The problem is the manufacturers, Samsung is usually still among the better ones, i.e. there are many updates. But: the phone is already very old, I wouldn't recommend it, because with an old phone, despite the goodwill of the manufacturers, updates simply end sooner. It came onto the market in September 2020
I would recommend the Xiaomi 11 Lite 5G, Xiaomi also offers a 3-year operating system and 4-year security updates warranty from Xiaomi for the phone. The Xiaomi 11 Lite 5G NE was launched in the third quarter of 2021, had Android 11 then and is now getting Android 12, then Android 13 and 14. It offers more in many areas, double the memory, 64Mpx camera and 256GB storage. It also has dual 5G support and the RAM can be expanded from 8 to 11 GB.
Xiaomi 11 Lite 5G NE (256 GB, White, White, 6.55 ", Hybrid Dual SIM, 64 Mpx, 5G)
I'm pretty confident in my answer, since I've purchased this before and researched it thoroughly.
The 5g version is with the Snapdragon 865 chipset and is slightly faster in some tasks (like video conversion, gaming, etc) and supports 5g of course.
The 4g version is using the Exynos 990 chipset, supporting only 4g. (@digitec there's probably a type in the specs)
Otherwise the phones are identical in screen/camera/battery/etc
For the small price difference I'd still get the 5g version.
Cheers
Wahrscheinlich Vietnam, mit einigen Teilen made in India: In 2019, Samsung announced that it has ended production of mobile phones in China, due to lack of Chinese demand. As of 2019 Samsung employs over 200,000 employees in the Hanoi-area of Vietnam to produce Smartphones, while offsourcing some manufacturing to China[120] and manufacturing large portions of its phones in India.
Quelle: Wikipedia...
It has a slightly older Qualcomm Snapdragon 865 inside. And this variant is only capable of 4G. A better choice would be the Xiaomi Poco X3 Pro, which costs only 289 francs and has a similarly fast Snapdragon 860 with 8GB RAM (Samsung only 6GB) and with 256GB twice as much memory as a Samsung S20 FE (128GB). The battery of the X3 Pro is 5120 mAh, which is considerably larger than that of the Samsung.
Xiaomi Poco X3 Pro (256GB, Phantom Black, 6.67 ", Hybrid Dual SIM, 48 Mpx, 4G)
It is the Swiss version and not the EU version. This is also evident in the manufacturer's number, which ends in EUC. EUC stands for sale in Switzerland