Windows 10 (on another drive) not showing up in grub menu after fresh Architect install

EFI only boot system.

I have 3 drives, 2 for Windows 10 (which was working fine before I installed) and 1 for Manjaro.
After I installed Architect, the Windows EFI boot is not in the grub menu, and when I run update-grub it does not show up. Its as if my Windows EFI is gone. I see the Windows partitions and can mount them, but I cant get update-grub to put a Windows boot in the grub menu.
I am at a loss.

Check all fat32 partitions in all disk and see if you have a /Microsoft/boot/whatever.efi anywhere.
If you don't have, you've formatted out while installing Manjaro.
The reinstall windows boot. And we'll help you with reinstalling manjaro boot again (it will be gone with installing windows boot).

If it is there anywhere, let us know where, what partition and what path. We'll boot it.

The only fat32 partition is my Manjaro disk:

Disk /dev/nvme0n1: 476.96 GiB, 512110190592 bytes, 1000215216 sectors
Disk model: Samsung SSD 970 PRO 512GB               
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: E5863DA4-5870-4940-AA55-213EE2F886A8

Device             Start        End   Sectors   Size Type
/dev/nvme0n1p1      2048      34815     32768    16M Microsoft reserved
/dev/nvme0n1p2     34816  999215417 999180602 476.5G Microsoft basic data
/dev/nvme0n1p3 999217152 1000212479    995328   486M Windows recovery environment


Disk /dev/sda: 931.53 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: CT1000MX500SSD1 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 108A7969-41BB-4636-B219-1ED71A65EDBB

Device       Start        End    Sectors  Size Type
/dev/sda1     2048    1050623    1048576  512M EFI System
/dev/sda2  1050624 1953523711 1952473088  931G Linux filesystem


Disk /dev/sdb: 3.65 TiB, 4000787030016 bytes, 7814037168 sectors
Disk model: Samsung SSD 860 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 843687B9-ACF5-4754-89CB-5E8F08AF461C

Device     Start        End    Sectors  Size Type
/dev/sdb1   2048 7814035455 7814033408  3.7T Microsoft basic data

I guess its gone!

I have the Windows install USB, so if I go to startup repair, will I loose my Manjaro boot (not a big deal)?

The Windows Startup Repair failed, I think I accidentally installed the Manjaro /boot/efi on the Windows disk, messing it all up. This was my mistake. I am going to reinstall Win10 and then very carefully install Manjaro Architect next.

You can share the same $esp fat32 partition but do not format when you install manjaro .
Or you can have separate $esp parititions which is better because some major window updates will thrash the manjaro efi files.

And to restore manjaro bootloader after installing windows, use this first post here. Just the [Simple First Start] will get you back on Manjaro.

Good luck.

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