I missed it. Boot-Repair did not add the efi Windows entries into 25_custom like it normally does.
You can manually add your own. See bug report for examples. The entries from os_prober will not work.
grub2's os-prober creates wrong style (BIOS) chain boot entry
type of entry from Boot-Repair that should work.
'Windows UEFI loader'
Type of entry that does not work:
'Windows ...) (on /dev/sdXY)'