Since configuring Git to use Windows SSH, SSH commands are broken

[rhaglennydd]

• I was not able to find an open or closed issue matching what I'm seeing

Setup

• Which version of Git for Windows are you using? Is it 32-bit or 64-bit?
  2.47.1.windows.1, 64-bit

$ git --version --build-options

git version 2.47.1.windows.1
cpu: x86_64
built from commit: 2cd22437f64229935dc564db969cbcbfed5e9045
sizeof-long: 4
sizeof-size_t: 8
shell-path: D:/git-sdk-64-build-installers/usr/bin/sh
feature: fsmonitor--daemon
libcurl: 8.11.0
OpenSSL: OpenSSL 3.2.3 3 Sep 2024
zlib: 1.3.1

• Which version of Windows are you running? Vista, 7, 8, 10? Is it 32-bit or 64-bit?
  Windows 11, 64-bit

$ cmd.exe /c ver

Microsoft Windows [Version 10.0.22631.4460]

• What options did you set as part of the installation? Or did you choose the
  defaults?

# One of the following:
> type "C:\Program Files\Git\etc\install-options.txt"
> type "C:\Program Files (x86)\Git\etc\install-options.txt"
> type "%USERPROFILE%\AppData\Local\Programs\Git\etc\install-options.txt"
> type "$env:USERPROFILE\AppData\Local\Programs\Git\etc\install-options.txt"
$ cat /etc/install-options.txt

Editor Option: VIM
Custom Editor Path:
Default Branch Option: main
Path Option: CmdTools
SSH Option: ExternalOpenSSH
Tortoise Option: false
CURL Option: OpenSSL
CRLF Option: LFOnly
Bash Terminal Option: MinTTY
Git Pull Behavior Option: Merge
Use Credential Manager: Enabled
Performance Tweaks FSCache: Enabled
Enable Symlinks: Enabled
Enable FSMonitor: Disabled

• Any other interesting things about your environment that might be related
  to the issue you're seeing?

Details

• Which terminal/shell are you running Git from? e.g Bash/CMD/PowerShell/other

Windows Terminal

• What commands did you run to trigger this issue? If you can provide a
  Minimal, Complete, and Verifiable example
  this will help us understand the issue.

ssh-add
ssh-add -l

• What did you expect to occur after running these commands?

After running ssh-add, I expected to be prompted for my key password and for it to add my key. After running ssh-add -l, I expected to see my key listed.

• What actually happened instead?

After running ssh-add and entering my key password, it responds Could not add identity "C:\Users\me/.ssh/id_ed25519": invalid format. After running ssh-add -l, it responds error fetching identities: invalid format. The key files are definitely there. It should be noted that when I run these commands in the Windows Command Prompt they are successful. I confirmed that ssh-add refers to the same program in both environments (i.e., C:\Windows\System32\OpenSSH\ssh-add.exe). The only thing I can think of is that the key was generated before I switched to using Windows SSH.

• If the problem was occurring with a specific repository, can you provide the
  URL to that repository to help us with testing?

[dscho]

Maybe the solution is as easy as appending a Line Feed character to that file?

[rhaglennydd]

Maybe the solution is as easy as appending a Line Feed character to that file?

Tried that, didn't make a difference.

[dscho]

What does file ~/.ssh/id_ed25519 print? For me, it prints "c/Users/me/.ssh/id_ed25519: OpenSSH private key".

[rhaglennydd]

Yeah, that's what I get.