You have a device with Workstation OS protected by a backup plan with enabled application backup.
After data center is updated to Acronis Cyber Cloud 8.0, the backup plan cannot be run or applied due to error "Device has no quota to apply backup plan"
You check the type of service quota assigned to the device (Device -> Details -> Service quota -> Change) and see that no quota is assigned.
Application backup requires service quota with "server" type to be applied to the device according to licensing policy
Assign service quota with "server" type for the device manually (Device -> Details -> Service quota -> Change). If you don't have service quota with "server" type consider obtaining it, if you need application aware backup. Alternatively, you can disable application backup and protect the device with workstation OS without application-aware backup using service quota with "workstation" type.