I'm experiencing this same issue, did you manage to resolve it?

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Go into the Org settings and disable the app restrictions. It doesn't make sense, but that's what's stopping it from working.

@Teun @jmtiimo Hello guys. Today I was facing the same error you mentioned in this ticket, and I successfully solved it.
The problem was that I set up ssh config for my ssh keys, and I always wrote in git clone command a wrong host(For example in config - github.com-hknio, but in git clone command I wrote github.com:hknio without -hknio after com). It was really funny that I followed initially by a correct tutorial, and set up everything correctly, but due to carelessness I spent more than 2h for this.

So a solution is this article: https://blog.gitguardian.com/8-easy-steps-to-set-up-multiple-git-accounts/. Please follow it and you will be able to keep both your work and personal git accounts on one device.

Example of my SSH Config:

# Work account
Host github.com-hknio
 HostName github.com
 User git
 IdentityFile ~/.ssh/id_rsa_hknio_1
# Personal account
Host github.com
 HostName github.com
 User git
 IdentityFile ~/.ssh/id_rsa_personal_1

Example of my .gitconfig.work file:

[user]
email = <My Work Email>
name = <My Name>
 
[github]
user = "My User NickName On Work GitHub"
 
[core]
sshCommand = "ssh -i ~/.ssh/id_rsa_hknio_1"

Example of my .gitconfig.pers file:

[user]
email = <My Personal Email>
name = <My Name>
 
[github]
user = "My User NickName On Personal GitHub"
 
[core]
sshCommand = "ssh -i ~/.ssh/id_rsa_personal_1"

Example of my .gitconfig router file which I put in the home directory:

[includeIf "gitdir:/Users/ah/Desktop/Development/"] 
path = /Users/ah/Desktop/Development/.gitconfig.pers
 
[includeIf "/Users/ah/Desktop/Hacken/"]
path = /Users/ah/Desktop/Hknio/.gitconfig.work
 
[core]
excludesfile = ~/.gitignore 

Conclusion: Hope it will be useful for you guys if your problem is still active. If any question will appear, feel free to tag me)

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I am setting up a new workstation and decided to stop using password authentication and only use SSH keys. This works. The ssh -T git@github.com command gives me the expected welcome message ("Hi Teun! You've successfully authenticated, ..."). My personal repositories can now be cloned by just running (example):

git clone git@github.com:Teun/teun.github.io.git

This also works for private repositories. However, when I try to clone a repository from an Organization I have, like so:

git clone git@github.com:WikiPhotoHunt/SvelteUI.git

It returns an error:

Cloning into 'SvelteUI'...
ERROR: Repository not found.
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.

I am Admin of the Organization and I can push and pull it from my old laptop (where I am logged in over HTTPS and password). I am certain of the naming (copied it from the GH UI). What else can be the cause of this difference?