The following steps can be referred if there are irregularities in the count of the machines in catalog (For example: If you have 10 machines in a catalog and have deleted machines 2 and 3. Now if you want to add new machines with count 2 and 3, you will have to modify the Identity Pool StartCount for that catalog).

1. Open Powershell as an administrator on the Delivery Controller. 
2. Run the command: asnp citrix* (To load the Citrix modules)
3. Check the start count for the identity pool of the catalog by running the command: Get-AcctIdentityPool -IdentityPoolName xxx. The IdentityPoolName will be the name of the catalog.
4. If you want to set this count to a different value, run the command by specifying the StartCount as X: Set-AcctIdentityPool -IdentityPoolName xxx -StartCount X.
5. Now add the machines to the catalog so that the machines are created with the required count.
6. After creating the machines, run the following command to set it back to the original value Y: Set-AcctIdentityPool -IdentityPoolName xxx -StartCount Y.

 

Modify the Identity Pool Start Count for a catalog