I have transfered my ssh key from my root to my user account by ssh-copy-id command

so now I have these files in my .ssh folder

user@user-php:~/.ssh$ ls

authorized_keys  config  id_rsa  id_rsa.pub  known_hosts

Now when I want to clone a project and actually the public key is in authorized_keys file it gives me error

user@user-php:/var/www/ts$ git clone [email protected]:/xxxx.git

Cloning into 'xxxx'...

Permission denied (publickey).

fatal: The remote end hung up unexpectedly

it is not pick up public key form authorized_keys

now why it not picking up the public key and is there any way i can tell git which public key to use.

EDIT:
i have also try one more thing i have copyied all the keys from root/.ssh folder to user/.ssh but it still gives Permission denied (publickey). error