We have similar situation. But guessing it may be due to appliance server storage spaces. As we were doing POC for only one AWS EC2 source server, we made Appliance EC2 only 200 GB instead of recommended 2*600 GB. We are redoing in case that is the issue. Otherwise we followed the documentation line by line. My ask is is the storage is the real issue or something else. It takes lot of time to setup the POC.