diff --git a/internal/command/delta.go b/internal/command/delta.go
index b9ee701..6c7457d 100644
--- a/internal/command/delta.go
+++ b/internal/command/delta.go
@@ -15,6 +15,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"regexp"
 
 	"github.com/score-spec/score-humanitec/internal/humanitec"
 	api "github.com/score-spec/score-humanitec/internal/humanitec_go/client"
@@ -74,6 +75,11 @@ func delta(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
+	// Validate the ID
+	if err := validateIDs(); err != nil {
+		return err
+	}
+
 	// Prepare a new deployment
 	//
 	log.Print("Preparing a new deployment...\n")
@@ -124,3 +130,22 @@ func delta(cmd *cobra.Command, args []string) error {
 
 	return nil
 }
+
+var validID = regexp.MustCompile(`^[a-z0-9](?:-?[a-z0-9]+)+$`)
+
+func validateIDs() error {
+	ids := []struct {
+		name string
+		id   string
+	}{
+		{"organization", orgID}, {"application", appID}, {"environment", envID},
+	}
+
+	for _, e := range ids {
+		if !validID.MatchString(e.id) {
+			return fmt.Errorf("invalid %s id '%s'. Did you use the %s name instead of the id?", e.name, e.id, e.name)
+		}
+	}
+
+	return nil
+}
diff --git a/internal/humanitec_go/client/deltas.go b/internal/humanitec_go/client/deltas.go
index 29703b5..6632554 100644
--- a/internal/humanitec_go/client/deltas.go
+++ b/internal/humanitec_go/client/deltas.go
@@ -57,7 +57,7 @@ func (api *apiClient) CreateDelta(ctx context.Context, orgID, appID string, delt
 		}
 
 	default:
-		return nil, fmt.Errorf("humanitec api: %s %s: HTTP %d - %s", req.Method, req.BaseURL, resp.StatusCode, http.StatusText(resp.StatusCode))
+		return nil, resError(req, resp)
 	}
 }
 
@@ -100,6 +100,10 @@ func (api *apiClient) UpdateDelta(ctx context.Context, orgID string, appID strin
 			return &res, nil
 		}
 	default:
-		return nil, fmt.Errorf("humanitec api: %s %s: HTTP %d - %s", req.Method, req.BaseURL, resp.StatusCode, http.StatusText(resp.StatusCode))
+		return nil, resError(req, resp)
 	}
 }
+
+func resError(req rest.Request, resp *rest.Response) error {
+	return fmt.Errorf("humanitec api: %s %s: unexpected response status %d - %s\n%s", req.Method, req.BaseURL, resp.StatusCode, http.StatusText(resp.StatusCode), resp.Body)
+}
diff --git a/internal/humanitec_go/client/deltas_test.go b/internal/humanitec_go/client/deltas_test.go
index 1df7870..145878c 100644
--- a/internal/humanitec_go/client/deltas_test.go
+++ b/internal/humanitec_go/client/deltas_test.go
@@ -87,7 +87,8 @@ func TestCreateDelta(t *testing.T) {
 		{
 			Name:          "Should handle API errors",
 			StatusCode:    http.StatusInternalServerError,
-			ExpectedError: errors.New("HTTP 500"),
+			ExpectedError: errors.New("unexpected response status 500 - Internal Server Error\nerror details"),
+			Response:      []byte(`error details`),
 		},
 		{
 			Name:          "Should handle response parsing errors",
@@ -208,6 +209,7 @@ func TestUpdateDelta_fail(t *testing.T) {
 		http.HandlerFunc(
 			func(w http.ResponseWriter, r *http.Request) {
 				w.WriteHeader(http.StatusNotFound)
+				w.Write([]byte("{\"error\": \"Not Found\"}"))
 			},
 		),
 	)
@@ -219,5 +221,5 @@ func TestUpdateDelta_fail(t *testing.T) {
 		{Modules: humanitec.ModuleDeltas{}},
 	})
 	assert.Nil(t, res)
-	assert.ErrorContains(t, err, ": HTTP 404 - Not Found")
+	assert.ErrorContains(t, err, ": unexpected response status 404 - Not Found\n{\"error\": \"Not Found\"}")
 }
diff --git a/internal/humanitec_go/client/deployments.go b/internal/humanitec_go/client/deployments.go
index 812afb5..c5b991c 100644
--- a/internal/humanitec_go/client/deployments.go
+++ b/internal/humanitec_go/client/deployments.go
@@ -67,6 +67,6 @@ func (api *apiClient) StartDeployment(ctx context.Context, orgID, appID, envID s
 
 		fallthrough
 	default:
-		return nil, fmt.Errorf("humanitec api: %s %s: HTTP %d - %s", req.Method, req.BaseURL, resp.StatusCode, http.StatusText(resp.StatusCode))
+		return nil, resError(req, resp)
 	}
 }
diff --git a/internal/humanitec_go/client/deployments_test.go b/internal/humanitec_go/client/deployments_test.go
index c4970eb..a8cd6ec 100644
--- a/internal/humanitec_go/client/deployments_test.go
+++ b/internal/humanitec_go/client/deployments_test.go
@@ -83,7 +83,8 @@ func TestStartDeployment(t *testing.T) {
 		{
 			Name:          "Should handle API errors",
 			StatusCode:    []int{http.StatusInternalServerError},
-			ExpectedError: errors.New("HTTP 500"),
+			Response:      []byte(`error details`),
+			ExpectedError: errors.New("unexpected response status 500 - Internal Server Error\nerror details"),
 		},
 		{
 			Name:          "Should handle response parsing errors",
@@ -99,7 +100,8 @@ func TestStartDeployment(t *testing.T) {
 			},
 			Retry:         false,
 			StatusCode:    []int{http.StatusConflict},
-			ExpectedError: errors.New("HTTP 409"),
+			Response:      []byte(`conflict details`),
+			ExpectedError: errors.New("unexpected response status 409 - Conflict\nconflict details"),
 		},
 		{
 			Name: "Should retry conflict errors with retry",
diff --git a/internal/humanitec_go/client/resources.go b/internal/humanitec_go/client/resources.go
index 6a052e7..359a3c4 100644
--- a/internal/humanitec_go/client/resources.go
+++ b/internal/humanitec_go/client/resources.go
@@ -48,6 +48,6 @@ func (api *apiClient) ListResourceTypes(ctx context.Context, orgID string) ([]hu
 		}
 
 	default:
-		return nil, fmt.Errorf("humanitec api: %s %s: HTTP %d - %s", req.Method, req.BaseURL, resp.StatusCode, http.StatusText(resp.StatusCode))
+		return nil, resError(req, resp)
 	}
 }
diff --git a/internal/humanitec_go/client/resources_test.go b/internal/humanitec_go/client/resources_test.go
index aaf1e20..8c04b6b 100644
--- a/internal/humanitec_go/client/resources_test.go
+++ b/internal/humanitec_go/client/resources_test.go
@@ -88,7 +88,8 @@ func TestListResourceTypes(t *testing.T) {
 		{
 			Name:          "Should handle API errors",
 			StatusCode:    http.StatusInternalServerError,
-			ExpectedError: errors.New("HTTP 500"),
+			ExpectedError: errors.New("unexpected response status 500 - Internal Server Error\nerror details"),
+			Response:      []byte(`error details`),
 		},
 		{
 			Name:          "Should handle response parsing errors",