diff --git a/plugins/notifiers/client.go b/plugins/notifiers/client.go
index b25301ed8..683c0b02c 100644
--- a/plugins/notifiers/client.go
+++ b/plugins/notifiers/client.go
@@ -21,7 +21,8 @@ type Config struct {
 	Provider string `mapstructure:"provider" validate:"omitempty,oneof=slack"`
 
 	// slack
-	Workspaces []slack.SlackWorkspace `mapstructure:"workspaces" validate:"required_if=Provider slack,dive"`
+	AccessToken string                 `mapstructure:"access_token" validate:"required_without=Workspaces"`
+	Workspaces  []slack.SlackWorkspace `mapstructure:"workspaces" validate:"required_without=AccessToken,dive"`
 
 	// custom messages
 	Messages domain.NotificationMessages
@@ -29,13 +30,49 @@ type Config struct {
 
 func NewClient(config *Config) (Client, error) {
 	if config.Provider == ProviderTypeSlack {
-		slackConfig := &slack.Config{
-			Workspaces: config.Workspaces,
-			Messages:   config.Messages,
+
+		slackConfig, err := NewSlackConfig(config)
+		if err != nil {
+			return nil, err
 		}
+
 		httpClient := &http.Client{Timeout: 10 * time.Second}
 		return slack.NewNotifier(slackConfig, httpClient), nil
 	}
 
 	return nil, errors.New("invalid notifier provider type")
 }
+
+func NewSlackConfig(config *Config) (*slack.Config, error) {
+
+	// validation
+	if config.AccessToken == "" && len(config.Workspaces) == 0 {
+		return nil, errors.New("slack access token or workspaces must be provided")
+	}
+	if config.AccessToken != "" && len(config.Workspaces) != 0 {
+		return nil, errors.New("slack access token and workspaces cannot be provided at the same time")
+	}
+
+	var slackConfig *slack.Config
+	if config.AccessToken != "" {
+		workspaces := []slack.SlackWorkspace{
+			{
+				WorkspaceName: "default",
+				AccessToken:   config.AccessToken,
+				Criteria:      "1==1",
+			},
+		}
+		slackConfig = &slack.Config{
+			Workspaces: workspaces,
+			Messages:   config.Messages,
+		}
+		return slackConfig, nil
+	}
+
+	slackConfig = &slack.Config{
+		Workspaces: config.Workspaces,
+		Messages:   config.Messages,
+	}
+
+	return slackConfig, nil
+}
diff --git a/plugins/notifiers/client_test.go b/plugins/notifiers/client_test.go
new file mode 100644
index 000000000..c30cf12bd
--- /dev/null
+++ b/plugins/notifiers/client_test.go
@@ -0,0 +1,111 @@
+package notifiers
+
+import (
+	"github.com/goto/guardian/plugins/notifiers/slack"
+	"reflect"
+	"testing"
+)
+
+func TestNewSlackConfig(t *testing.T) {
+	type args struct {
+		config *Config
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    *slack.Config
+		wantErr bool
+	}{
+		{
+			name: "should return error when no access token or workspaces are provided",
+			args: args{
+				config: &Config{
+					Provider: ProviderTypeSlack,
+				},
+			},
+			want:    nil,
+			wantErr: true,
+		}, {
+			name: "should return error when both access token and workspaces are provided",
+			args: args{
+				config: &Config{
+					Provider:    ProviderTypeSlack,
+					AccessToken: "foo",
+					Workspaces: []slack.SlackWorkspace{
+						{
+							WorkspaceName: "default",
+							AccessToken:   "bar",
+							Criteria:      "1==1",
+						},
+					},
+				},
+			},
+			want:    nil,
+			wantErr: true,
+		}, {
+			name: "should return slack config when access token is provided",
+			args: args{
+				config: &Config{
+					Provider:    ProviderTypeSlack,
+					AccessToken: "foo",
+				},
+			},
+			want: &slack.Config{
+				Workspaces: []slack.SlackWorkspace{
+					{
+						WorkspaceName: "default",
+						AccessToken:   "foo",
+						Criteria:      "1==1",
+					},
+				},
+			},
+			wantErr: false,
+		}, {
+			name: "should return slack config when workspaces are provided",
+			args: args{
+				config: &Config{
+					Provider: ProviderTypeSlack,
+					Workspaces: []slack.SlackWorkspace{
+						{
+							WorkspaceName: "A",
+							AccessToken:   "foo",
+							Criteria:      "$email contains '@abc'",
+						},
+						{
+							WorkspaceName: "B",
+							AccessToken:   "bar",
+							Criteria:      "$email contains '@xyz'",
+						},
+					},
+				},
+			},
+			want: &slack.Config{
+				Workspaces: []slack.SlackWorkspace{
+					{
+						WorkspaceName: "A",
+						AccessToken:   "foo",
+						Criteria:      "$email contains '@abc'",
+					},
+					{
+						WorkspaceName: "B",
+						AccessToken:   "bar",
+						Criteria:      "$email contains '@xyz'",
+					},
+				},
+			},
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := NewSlackConfig(tt.args.config)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("NewSlackConfig() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("NewSlackConfig() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/plugins/notifiers/slack/client_test.go b/plugins/notifiers/slack/client_test.go
index 75b25fc87..77cfd181a 100644
--- a/plugins/notifiers/slack/client_test.go
+++ b/plugins/notifiers/slack/client_test.go
@@ -60,7 +60,6 @@ func (s *ClientTestSuite) TestNotify() {
 		s.mockHttpClient.On("Do", mock.Anything).Return(resp, nil)
 		expectedErrs := []error{
 			fmt.Errorf("[appeal_id=test-appeal-id] | %w", errors.New("error finding slack id for email test-user@abc.com in workspace: ws-1 - users_not_found")),
-			fmt.Errorf("[appeal_id=test-appeal-id] | error sending message to user:test-user@abc.com in workspace: | %w", errors.New("EOF")),
 		}
 
 		notifications := []domain.Notification{