@aliasmask and @TheCdog4114
Unfortunately the "Hazelnutbeard" error isn't listed. I suggest that you write out a support ticket.
I have taken the liberty to alphabetize them. :o)
AlabasterBeard, AllmondBeard & CyanBeard
Your connection to Xbox Live and/or the Sea of Thieves services has been disrupted or lost. Please check your console's network status via the Settings > Network menu.
AllmondBeard Please see "AlabasterBeard"
(but don't point-out or make fun of the spelling "allmond" "almond" as they invented the English language. lol)
Ashbeard
You must be signed into Xbox Live to play Sea of Thieves. Ensure your Xbox Live status is connected and then sign in and try again.
AvocadoBeard
When playing on an Xbox One console, you need an Xbox Live Gold membership to play online. Please check your subscription settings and purchase a Gold membership as needed.
Beigebeard / LightbeigeBeard
You do not currently have the latest version of the game installed. Please check for updates.”
CinnamonBeard & BronzeBeard
We were unable to connect you to the game. Please do the following:
Press the Guide Button on your controller
Highlight Sea of Thieves
Press the Menu Button (to the right of the Guide Button on your controller)
Highlight "Quit" and press A
Re-launch Sea of Thieves from your Pins, Recent or My Games & Apps areas of your console
Navigate the menu and join a game as usual
CyanBeard Please see "AlabasterBeard"
DaffodilBeard
Something has happened on our side that we're working to fix. Please check the status of the game at seaofthieves.com for more information.
Fishbeard
This is an issue with our servers, the team are hard at work, we will get everyone back in and playing as quickly as possible!
FluffyBeard
We have either taken the servers down for an update, or we are not currently running a playtest session at this time. Please verify there is a scheduled playtest running in your timezone.
Greybeard
This is an issue with our servers, the team are hard at work, we will get everyone back in and playing as quickly as possible!
KiwiBeard
This can be caused by any of the following:
The Servers Are Closed – We are not running a play session when you tried to log in, so you cannot play Sea of Thieves right now.
You have more than one Gamertag signed in to your console. Please sign all other accounts out of the console, and only launch the game with the one account that has been invited to play.
Lapisbeard
Something has happened on our side that we're working to fix. Please check the status of the game at seaofthieves.com for more information.
Lavenderbeard
Can arise if new players are temporarily prevented from joining the game as part of an effort to resolve server issues. If this is the case, we'll get everyone back in and playing as quickly as possible! This may also be caused by antivirus/firewall settings, proxy servers or other network management/manipulation tools.
Lazybeard
You have been removed from the active game session due to lack of activity.
LightbeigeBeard Please see "BeigeBeard"
Your error is not listed, or need more help?
Head to https://support.seaofthieves.com to raise a ticket, one of our team will get back to you ASAP!