Steps Branch repos: which was giving error and and here is the right way
1-Go and create your branch
2-Clone the branch
3- the open git bash and write the following for example here I created a new branch and named it Server
git clone –single-branch –branch Server https://sen@dev.azure.com/sendomanin/orgname/_git/adminportl-services
once cloned then go inside the folder and open bash again.
3-then go inside the folder and call get bush from inside git and add and push your codes