When I start Epic Games it tells me that I have an unsupported graphic card. When I had Windows it worked, now I use manjaro. I am using a “AMD Radeon HD 8670M”
I use an Nvidia card and was having this same problem. This may or may not help you but I thought I would mention what worked for me even though they are different Graphics Cards.
What I did was I went into configure for Epic Games Store then went to “System Options”, then I scrolled down to the section that says “Multi-GPU”, where it says “Vulkan ICD Loader” in my case it had “Unspecified: Unknown GPU (Default)” selected. I changed it for my Card to Nvidia Proprietary and that solved the problem for me. But there is an option there to select AMD.
Not sure if this will help you or not, but it worked for me and I thought it was worth mentioning in case it might help you or others.