We had an “unexpected” issue at a customer which I troubleshooted. I was unable to connect to the Central Administration and I tried to add my account to the Farm Administrators group using PowerShell as a possible solution. The issue occurred on a SharePoint 2013 environment but the below screenshots have been taken from a SharePoint 2019 environment.

First start the SharePoint 2019 Management Shell as administrator

Use the below commands to retrieve the current Farm Administrators

$WebApp = get-spwebapplication -includecentraladministration | where-object {$_.DisplayName -like "SharePoint Central Administration*"}
$Web = Get-SPweb($WebApp.Url)
$FarmAdminGroup = $Web.SiteGroups["Farm Administrators"]

Next run the following commands to add the user to the Farm Administrators group.

$user = "Domain\UserID"
$FarmAdminGroup.AddUser($user, "", $user, "")

You can run the following commands again to retrieve the list of current Farm Administrators.

$FarmAdminGroup = $Web.SiteGroups["Farm Administrators"]

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