jenkin git repository getting permission denied(publickey, password) for internal ssh server url

Question

I'm trying to configure flow which include git repository

things to note:

• i have a git server running in internal network
• my jenkin running on one of the machine in the network so it can access git server through local ip

normally i would go like this with my git command

git remote add origin ssh://username@git-server-ip/path-to-folder 

after that it prompt me to type in the password for the above username

and i can work on the git repo like normal

The problems:

in Jenkin i already set up credential with "username and password" type

When i paste in the ssh url into the Repository URL, it take a while and return error:

Failed to connect to repository ...

stdout: stderr: Permission denied, please try again. Permission denied, please try again. username@git-server-ip: Permission denied (publickey, password). fatal: Could not read from remote repository.

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

i had selected credentials and double check username and password it's correct. i tried running the ls-remote command manually in the terminal

git ls-remote -h -- ssh://username@git-server-ip/path-to-folder HEAD

it prompts to input the password, i typed it in and it run normal without error

Why is the error only happens on Jenkins when i input the repo ssh url? is username and password credential the wrong approach for credential? what else should i use?

there no guide online for Jenkin with internal git ssh url as i known of

the closest i can see my problem related to is this question Jenkins Git ssh setup does not let me use username/password , but it doesn't have an accepted answer yet, and the answer suggest going with "ssh username and private key"