diff --git a/pkg/csi/manila/adapters_test.go b/pkg/csi/manila/adapters_test.go
new file mode 100644
index 0000000000..c3d4b15c82
--- /dev/null
+++ b/pkg/csi/manila/adapters_test.go
@@ -0,0 +1,66 @@
+/*
+Copyright 2026 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package manila
+
+import (
+	"testing"
+
+	"k8s.io/cloud-provider-openstack/pkg/csi/manila/options"
+)
+
+func TestGetAccessIDs(t *testing.T) {
+	tests := []struct {
+		name     string
+		opts     *options.NodeVolumeContext
+		expected []string
+	}{
+		{
+			name:     "shareAccessIDs takes precedence over shareAccessID",
+			opts:     &options.NodeVolumeContext{ShareAccessIDs: "new-1,new-2", ShareAccessID: "old-1"},
+			expected: []string{"new-1", "new-2"},
+		},
+		{
+			name:     "only shareAccessIDs",
+			opts:     &options.NodeVolumeContext{ShareAccessIDs: "id-1,id-2,id-3"},
+			expected: []string{"id-1", "id-2", "id-3"},
+		},
+		{
+			name:     "only shareAccessID (deprecated)",
+			opts:     &options.NodeVolumeContext{ShareAccessID: "id-1"},
+			expected: []string{"id-1"},
+		},
+		{
+			name:     "neither set",
+			opts:     &options.NodeVolumeContext{},
+			expected: nil,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			result := getAccessIDs(tc.opts)
+			if len(result) != len(tc.expected) {
+				t.Fatalf("got %v, want %v", result, tc.expected)
+			}
+			for i := range result {
+				if result[i] != tc.expected[i] {
+					t.Errorf("index %d: got %q, want %q", i, result[i], tc.expected[i])
+				}
+			}
+		})
+	}
+}
diff --git a/pkg/csi/manila/options/shareoptions.go b/pkg/csi/manila/options/shareoptions.go
index af6668e9b6..fb3c2950dc 100644
--- a/pkg/csi/manila/options/shareoptions.go
+++ b/pkg/csi/manila/options/shareoptions.go
@@ -43,8 +43,8 @@ type ControllerVolumeContext struct {
 type NodeVolumeContext struct {
 	ShareID        string `name:"shareID" value:"optionalIf:shareName=." precludes:"shareName"`
 	ShareName      string `name:"shareName" value:"optionalIf:shareID=." precludes:"shareID"`
-	ShareAccessID  string `name:"shareAccessID" value:"optionalIf:shareAccessIDs=." precludes:"shareAccessIDs"` // Keep this for backwards compatibility
-	ShareAccessIDs string `name:"shareAccessIDs" value:"optionalIf:shareAccessID=." precludes:"shareAccessID"`
+	ShareAccessID  string `name:"shareAccessID" value:"optional"`  // Deprecated: use shareAccessIDs
+	ShareAccessIDs string `name:"shareAccessIDs" value:"optional"` // Preferred; takes precedence over shareAccessID
 
 	// Adapter options
 
diff --git a/pkg/csi/manila/options/shareoptions_test.go b/pkg/csi/manila/options/shareoptions_test.go
new file mode 100644
index 0000000000..f7826e5a10
--- /dev/null
+++ b/pkg/csi/manila/options/shareoptions_test.go
@@ -0,0 +1,82 @@
+/*
+Copyright 2026 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package options
+
+import (
+	"testing"
+)
+
+func TestNewNodeVolumeContextShareAccessIDBackwardsCompat(t *testing.T) {
+	tests := []struct {
+		name          string
+		data          map[string]string
+		wantAccessID  string
+		wantAccessIDs string
+		wantErr       bool
+	}{
+		{
+			name: "only shareAccessIDs set",
+			data: map[string]string{
+				"shareID":        "share-1",
+				"shareAccessIDs": "access-1,access-2",
+			},
+			wantAccessIDs: "access-1,access-2",
+		},
+		{
+			name: "only shareAccessID set (deprecated)",
+			data: map[string]string{
+				"shareID":       "share-1",
+				"shareAccessID": "access-1",
+			},
+			wantAccessID: "access-1",
+		},
+		{
+			name: "both set, should not error",
+			data: map[string]string{
+				"shareID":        "share-1",
+				"shareAccessID":  "access-old",
+				"shareAccessIDs": "access-new-1,access-new-2",
+			},
+			wantAccessID:  "access-old",
+			wantAccessIDs: "access-new-1,access-new-2",
+		},
+		{
+			name: "neither set",
+			data: map[string]string{
+				"shareID": "share-1",
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			opts, err := NewNodeVolumeContext(tc.data)
+			if (err != nil) != tc.wantErr {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if tc.wantErr {
+				return
+			}
+			if opts.ShareAccessID != tc.wantAccessID {
+				t.Errorf("ShareAccessID = %q, want %q", opts.ShareAccessID, tc.wantAccessID)
+			}
+			if opts.ShareAccessIDs != tc.wantAccessIDs {
+				t.Errorf("ShareAccessIDs = %q, want %q", opts.ShareAccessIDs, tc.wantAccessIDs)
+			}
+		})
+	}
+}