Conflict cloning public github repository Github - NPM - SSH - not access rights

I am trying to use NPM to require a library https://github.com/geckosio/geckos.io. It seems it is downloaded via SSH using a git command but it fails.

My SSH files and config seem to be right:

ssh -T git@github.com
Enter passphrase for key 'C:\Users\Lander/.ssh/id_rsa':
Hi Lander! You've successfully authenticated, but GitHub does not provide shell access.

Even I can pull, push, etc:

 git pull
Enter passphrase for key '/c/Users/Lander/.ssh/id_rsa':
Already up to date.

I am trying to use NPM to require a library, but GIT says I have not the required rights. I suppose it is a publicly readable repository.

npm install geckosio/client -save
npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead.
npm ERR! code 128
npm ERR! An unknown git error occurred
npm ERR! command git --no-replace-objects ls-remote ssh://git@github.com/geckosio/client.git
npm ERR! git@github.com: Permission denied (publickey).
npm ERR! fatal: Could not read from remote repository.
npm ERR!
npm ERR! Please make sure you have the correct access rights
npm ERR! and the repository exists.

git --no-replace-objects ls-remote ssh://git@github.com/geckosio/client.git
Enter passphrase for key '/c/Users/Lander/.ssh/id_rsa':
ERROR: Repository not found.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Please, What am I missing? Thank you!

=================================== EXTRA 1 =================================== Testing @SebDieBln, here is the output

npm install @geckos.io/client
En línea: 1 Carácter: 13
+ npm install @geckos.io/client
+             ~~~~~~~
El operador de expansión '@' no se puede usar para hacer referencia a variables en una expresión. '@geckos' solamente se puede usar como argumento para un comando. Para hacer referencia a variables en una 
expresión, use '$geckos'.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : SplattingNotPermitted

It is the same problem that the official method gave to me:

npm i @geckos.io/client @geckos.io/server
En línea: 1 Carácter: 7
+ npm i @geckos.io/client @geckos.io/server
+       ~~~~~~~
El operador de expansión '@' no se puede usar para hacer referencia a variables en una expresión. '@geckos' solamente se puede usar como argumento para un comando. Para hacer referencia a variables en una 
expresión, use '$geckos'.
En línea: 1 Carácter: 25
+ npm i @geckos.io/client @geckos.io/server
+                         ~~~~~~~
El operador de expansión '@' no se puede usar para hacer referencia a variables en una expresión. '@geckos' solamente se puede usar como argumento para un comando. Para hacer referencia a variables en una 
expresión, use '$geckos'.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : SplattingNotPermitted

Am I using too new Node and NPM versions?

++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++++++++++++++++++++++++++++

Ok, finally solved, the problems were:

The package data was wrong. I was trying to use that 'construction' because I had problems with the "@". (NPM could had given an error if it is true that the package reference was wrong???)
Windows was not accepting "@". That is the reason I changed "npm i @geckos.io/client @geckos.io/server" to "npm install geckosio/client -save". (and was done in a bad way)

Thank everybody.

Solution

Why are you trying to fetch the sources of the required package?

Would a

npm install @geckos.io/client

work for you?

If you really need the sources, be sure to look at the right place: There is no repository github.com/geckosio/client. However there seems to be a folder package/client in the repo github.com/geckosio/geckos.io.