@AndresFreundTec first time I got an M.2 NVMe device, I didn't plug it in well enough (didn't push it in completely as I was afraid to damage it). To my surprise it did negotiate a PCIe link successfully, but not the highest one it was supposed to be capable of (LnkCap2/LnkCtl2 discrepancy in lspci). Unplugging and plugging it back in solved it for me.
I wouldn't exclude some physical connectivity issue or interference as the reason for AER errors either.
Although there might be other reasons why it can't reach full speed ('dmesg' should tell you 'PCIe bandwidth, limited by')
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