This error is probably one of the most common and first errors you will see when creating pools. Things like not releasing the IP address from the master, issues with the instant clone service account not having the correct rights in AD for the OU's where you are creating computer accounts and other items can cause this.
Here are some sample links and previous community posts that had the same/similar issue
thank you...below is how we resolved.
1.) cp-template delete by itself after 12 min and this was due to timeout value from connection server which is 600 sec
2.) Hence push the previous working image its working fine hence found the problem that its only with latest snapshot
3.) As per vmware support since our master image itself taking longer time to boot it might have it the following kb VMware Knowledge Base with windows 10 1809 hence the workaround was to to take new clone and snap to push
4.) the recommendation is to to upgrade the OS version to 1903 along with view connection server.
5.) our environment also having version 1803 without any issue and the boot is faster.