1. Device appears offline in Protection Console. 
  2. When you check Acronis services on the machine, Acronis Agent Core service is stopped and fails to start (without any changes on machine, updates, etc)
  3. Aakore logs contain errors similar to:

    C:\\ProgramData\\Acronis\\Agent\\var\\aakore\\host-alias.yaml': yaml: control characters are not allowed"}

Activity (refreshing location, deleting archives, etc.) finishes with error:

Failed to connect to the Agent Core service on this machine