Hello, it is not recommended that you use USB adapter, it is recommended that you use USB3.0 USB cable to connect directly to the USB port of the computer. Note that the USB port of the computer also has USB2.0 and USB3.0, please choose the USB3.0 port of the computer, I hope it will help you, thank you.
Your initial post is confusing, you mentioned both EP06 and EM06 there. The title says EM06 and mpcie, but EM06 is NGFF (M.2) modem, you cannot fit it into mPCI-E connector without intermediate adapter.
Yes, you right, i have mean EP06-E, anyway, answer of Quectel Support is nonsense as yours. Because - if i have installed modem in mpcie adapter and modem have answered by AT command, it’s already clear that question was about compatibility of USB 3.0 by EP06-E modem in USB 3.0 adapter mentioned in first post.
Seem that USB 3.0 bus doesn’t support by EP06-E modem, but it have in product specification and hardware description: