After adding a new preboot driver to the driver database, and rebuilding, you may receive an error stating Failed to add driver with error (0x80070002), returning 602 (BDC_ERR_WIM_INSERT_DRIVER)
You may verify the new driver appears to be in ...\Platforms\WinPE\x64\Driver\Custom\Drivers.. folder but failing to insert to the image.
Release : 8.6
Improperly named drivers
This particular issue was caused by the driver's .sys and .dll files being named incorrectly from the vendor. The driver was named e1d.sy_ and e1dmsg.dl_. Notice the underscore.
Make sure the drivers are named properly, which you could verify in the .inf file, and then add them to a .zip file and upload through the Deployment Solution Driver Database.