Can't install WTG on my external SSD

[admin]

The problem is that you did not format the ESP partition as FAT32 format.

We recommend that you convert the external hard drive to MBR partition scheme and create two or more patitions (one small FAT32 partition for the system partition, one NTFS partition for the boot partition, and other partitions for data partition), then use WinToUSB to create Windows To Go following the guide below:
http://www.easyuefi.com/wintousb/faq/en_...ToUSB.html

The best partition layout is as follow:
Partition 1 FAT32   100M         System partition
Partition 2 NTFS     ...G             Boot partition
Partition 3 ...          ...G            Other partition
...                                           Other partition


In particular, both the system partition and boot partition must be primary partition, and we recommend using built-in Disk Management int Windows to partition and format the disk. This type of Windows To Go drive can boot both BIOS-based and UEFI-based computers.

Reference:
What are system partitions and boot partitions:
http://www.easyuefi.com/wintousb/faq/en_...tions.html

Best regards,