RSTUDIO Package Manager (RSPM) , not able to add internal packages to git.

Hi Team we are trying to add R packages from our internal organization git-hub to our Rstudio package manager , we are facing below error . Can anybody guide us on the steps to solve it.
Is it due to the SSH keys permission issue? Any valuable help here would be appreciated.
ERROR: Repository not found.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
we are using the below command to add .
rspm create git-builder --source=[git source name] --url=[URL] --branch=[branch name] --ssh-key=[key name] --build-trigger=tags