Database Maintenance fails with error: "Failed to connect to server domain\xxxxxx" (4332054)

Failed to connect to server Domain\servername.

   at Microsoft.SqlServer.Management.Smo.DatabaseCollection.get_Item(String name)

   at AA.AFS.ASM.Maintenance.DBMaintenanceProvider.RunDBMaintenance()

   at AA.AFS.ASM.Maintenance.DBMaintenanceProvider.b__0()

   at System.Threading.Tasks.Task.InnerInvoke()

   at System.Threading.Tasks.Task.Execute()

Cannot open user default database. Login failed.

Login failed for user domain\xxxxxxx'.

   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)

   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)

   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader