Note:
Memtest 86 and Memtest86+ and different programs.
We stopped using Memtest86 years ago because the developer was not updating it to work with newer RAM regularly. I only use Memtest86+ from Memtest.org now.
I understand that Passmark software purchased Memtest86 from the original developer and is reissuing it. I don't know if it has been updated to work with the newest RAM.
But for best results in getting feedback in this forum I would stick to Memtest86+ - since that's what most folks are familiar with.