Windows 10 boot loader refuses to boot Linux Mint

Recently, I successfully installed Linux Mint alongside Windows 10 on my Surface Pro (5th gen). Additional info: the entire Windows 10, EFI partition as well as /boot are located on the internal SSD, while the rest of the Linux Mint is located on a microSD Card I'm able to start both systems by

1. changing the boot order under UEFI and rebooting
2. choosing them under System Recovery > Use a device
3. choosing them in GRUB2

But when I add a new entry to Windows Boot Loader using bcdedit, I get

Windows Boot Manager: Windows failed to start. A recent hardware or software change might be the cause. (...) File: \EFI\ubuntu\shimx64.efi Status: 0xc000007b Info: The application or operating system couldn't be loaded because a required file is missing or contains errors. (...)

Here are both "ubuntu" and "Linux Mint Secure Boot" entries I tried adding to boot loader.

Windows Boot Manager
--------------------
identifier              {7bad4997-b785-11ea-973b-bc8385dcf86d}
device                  partition=\Device\HarddiskVolume1
path                    \EFI\ubuntu\shimx64.efi
description             Linux Mint Secure Boot
locale                  en-GB
inherit                 {globalsettings}
isolatedcontext         Yes
default                 {current}
resumeobject            {13cafe29-938d-11ea-934d-a6104c97f139}
displayorder            {current}
toolsdisplayorder       {memdiag}
timeout                 30


Firmware Application (101fffff)
-------------------------------
identifier              {dfb5bb01-b94d-11ea-af00-806e6f6e6963}
device                  partition=\Device\HarddiskVolume1
path                    \EFI\ubuntu\shimx64.efi
description             ubuntu
isolatedcontext         Yes

How do I get Windows Boot Loader to boot Linux Mint?