You cannot create Droplets in certain datacenters due to limited capacity. If you have snapshots in a limited capacity datacenter, transfer them to another datacenter to create Droplets from them.
As a temporary workaround, new DigitalOcean users who begin with team account can transfer snapshots to other users via teams instead of directly via email address.
Snapshots do not retain the IP address of the Droplet they were created from, but you can use reserved IPs to assign the same address to new or redeployed Droplets.