OK, I've run OC in debug mode and it generated 3 txt files. The first 2 are full of "success" reports, but the end of the last one there are a bunch of issues (excerpt below). I don't know if this relates to the string for Innie, where my NVMe drive seems to have very long string as reported by gfxutil - PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/Pci(0x2,0x0)/Pci(0x0,0x0). Should the whole lot be used? It seems a lot longer than the example in the guide.
29:126 00:058 OCB: Adding bless entry on disk - PciRoot(0x0)/Pci(0x1F,0x2)/Sata(0x3,0x0,0x0)/HD(1,GPT,C0CE9492-C62B-4362-BD3D-9205F22BFA03,0x28,0x64000)
29:179 00:052 OCBP: Blessed file is missing
29:237 00:058 OCBP: Blessed folder is missing
29:290 00:052 OCBP: Predefined <nil> \System\Library\CoreServices\boot.efi is missing - Not Found
29:349 00:058 OCBP: Predefined <nil> \EFI\Microsoft\Boot\bootmgfw.efi is missing - Not Found
29:361 00:012 OCBP: Predefined <nil> \EFI\BOOT\BOOTX64.EFI was found
29:415 00:053 OCB: Adding entry type (T:1|F:0|G:1) - PciRoot(0x0)/Pci(0x1F,0x2)/Sata(0x3,0x0,0x0)/HD(1,GPT,C0CE9492-C62B-4362-BD3D-9205F22BFA03,0x28,0x64000)/\EFI\BOOT\BOOTX64.EFI
29:467 00:052 OCB: Discarding discovered OpenCore bootloader
29:526 00:058 OCBP: APFS recovery volume handle missing - \EFI\BOOT\
29:599 00:073 OCB: APFS recovery is not present - Not Found
29:662 00:062 OCB: Adding bless entry on disk - PciRoot(0x0)/Pci(0x1F,0x2)/Sata(0x3,0x0,0x0)/HD(3,GPT,D5720D79-4780-4B3E-A454-A6B789F3D46D,0xE8E5DCC8,0x40000)
29:689 00:026 OCBP: Blessed file is missing
29:737 00:048 OCBP: Blessed folder is missing
29:790 00:052 OCBP: Predefined <nil> \System\Library\CoreServices\boot.efi is missing - Not Found
29:848 00:058 OCBP: Predefined <nil> \EFI\Microsoft\Boot\bootmgfw.efi is missing - Not Found
29:901 00:052 OCBP: Predefined <nil> \EFI\BOOT\BOOTX64.EFI is missing - Not Found
29:960 00:058 OCB: Adding bless entry on disk - PciRoot(0x0)/Pci(0x1F,0x2)/Sata(0x3,0x0,0x0)/HD(4,GPT,FD79F332-6872-47B0-ABFF-5D39E0D0D91C,0xE8E9DCC8,0xE8D2E1C0)
30:012 00:052 OCBP: Blessed file is missing
30:026 00:013 OCBP: Blessed folder is missing
30:078 00:052 OCBP: Predefined <nil> \System\Library\CoreServices\boot.efi is missing - Not Found
30:137 00:058 OCBP: Predefined <nil> \EFI\Microsoft\Boot\bootmgfw.efi is missing - Not Found
30:190 00:052 OCBP: Predefined <nil> \EFI\BOOT\BOOTX64.EFI is missing - Not Found