Multiple Agents against single Pool

Hi Experts,

I have following 3 VMs:

1- Development

2- RahmanD365U12

3- EhtashamD365

I am doing all the developments over Development VM. I have setup the VSTS and doing check-ins.

On other two VMs, I have configured the Build Agent.

Now in my scenario, when I make the check-in, only one VM gets updated while the other VM's agent sit Idle. What am I missing? I want to make single check-in and things should get deployed over both VMs.

Is it possible to execute the Builds over the single Pool with different agents? Or we need to create separate? Kindly suggest