I'm running a masternode since over 1 week and I got no reward.
When I check the status of my masternode using "mirai-cli masternode list" it tells me the masternode is "ENABLED".
Do I need to install sentinel in order to make my masternode working or what can be the reason I'm getting no reward?
Try checking the status using ./mirai-cli masternode status
A week is too long, but i am guessing that you have hit the start-alias button regularly, which sends you to the back of the rewards queue.
The best thing you can do is go to
https://masternodes.online/monitoring/ and add your masternode ip.
It will alert you if there is any problem with your masternode.
If you continue to have problems, come see us in the discord:
https://discord.gg/rsaNYJd