[6.9.2] Cant register trial version with M.2 disk installed in PC

Hi guys!

I want to write about my first steps with UNRAID. I believe it can help others because while troubleshooting my installation, I looked through many different unsolved threads on the forum with similar problems.

TLDR Unraid system doesn't work when M.2 disk installed in PC. BETA version of Unraid (6.10.0-rc2) was clearly confusing M.2 disk with flash memory.

Yesterday was my first day (and also night) with Unraid. I wanted to try the trial version as this was my first experience with Unraid.
I have encountered many problems with flash drive activation. I tried 4 different devices with USB2.0 and USB3.0. After the first boot up and looking into the system via WebGUI the ENOFLASH6 error was reported. Pulling the flash drive out of the USB port and reinserting it solved this problem and a button to register the trial version appeared. After clicking it, a window appeared with information that the version was registered. However, after switching to another tab, it was still visible that this version is unregistered. It was also basically impossible to change the main settings, to start the array.
After many attempts, I decided to install the beta version, where I noticed that the UNRAID system mistook the M.2 drive for a Pendrive(M.2 was visible as "FLASH") . So I decided to go back to the stable version 6.9.2 and remove the M.2 drive from the computer.
It turned out that removing the M.2 drive from the computer solved all the problems and the trial version registration was successful. Further configuration actions were also possible.
In the original configuration, I used only the Unraid system flash drive and the M.2 drive.
After removing the M.2 drive I used the Unraid system flash drive and the SATA SSD.

After reading the forum I know that UNRAID is hardware agnostic but just in case my hardware is:
Motherboard: Gigabyte Technology Co. Ltd. B550 AORUS ELITE V2 (AM4)
Processor: AMD Ryzen 9 3900X
Pendrive: Lexar