If the hostname of your MacBook doesn't match across various places (Terminal, System Preferences, iCloud) - you can fix it with the steps in this Ask Different question.
I've also included the answer here, for my own sanity.
- Open a terminal.
- Type the following command to change the primary hostname of your Mac:
This is your fully qualified hostname, for example myMac.domain.com
sudo scutil --set HostName <new host name>
- Type the following command to change the Bonjour hostname of your Mac:
This is the name usable on the local network, for example myMac.local.
sudo scutil --set LocalHostName <new host name>
- If you also want to change the computer name, type the following command:
This is the user-friendly computer name you see in Finder, for example myMac.
sudo scutil --set ComputerName <new name>
- Flush the DNS cache by typing:
- Restart your Mac.
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