diff --git a/src/constants/messages.ts b/src/constants/messages.ts
index b0ceced2..b696c687 100644
--- a/src/constants/messages.ts
+++ b/src/constants/messages.ts
@@ -115,6 +115,9 @@ export const FAILURE_MESSAGES = {
     'INVITATION_CSV_TEMPLATE_ITEM_DOES_NOT_EXIST',
   INVITATION_CANNOT_CREATE_STRUCTURE_IN_NON_FOLDER_ITEM:
     'INVITATION_CANNOT_CREATE_STRUCTURE_IN_NON_FOLDER_ITEM',
+  MEMBERSHIP_ALREADY_EXISTS: 'MEMBERSHIP_ALREADY_EXISTS',
+  MEMBERSHIP_REQUEST_ALREADY_EXISTS: 'MEMBERSHIP_REQUEST_ALREADY_EXISTS',
+  MEMBERSHIP_REQUEST_NOT_FOUND: 'MEMBERSHIP_REQUEST_NOT_FOUND',
 };
 
 export const DEFAULT_FAILURE_MESSAGE = FAILURE_MESSAGES.UNEXPECTED_ERROR;
diff --git a/src/langs/en/messages.json b/src/langs/en/messages.json
index 7828c1dc..507037eb 100644
--- a/src/langs/en/messages.json
+++ b/src/langs/en/messages.json
@@ -137,5 +137,8 @@
   "INVITATION_CSV_NO_FILE_PROVIDED": "No file was provided. Please provide a file for creating bulk invitations",
   "INVITATION_CSV_NO_DATA_IN_FILE": "No data was found in the file. Please send a file with valid data.",
   "INVITATION_CSV_TEMPLATE_ITEM_DOES_NOT_EXIST": "The template item does not exist.",
-  "INVITATION_CANNOT_CREATE_STRUCTURE_IN_NON_FOLDER_ITEM": "Provided item is not a folder. A structure cannot be created inside an item that is not a folder."
+  "INVITATION_CANNOT_CREATE_STRUCTURE_IN_NON_FOLDER_ITEM": "Provided item is not a folder. A structure cannot be created inside an item that is not a folder.",
+  "MEMBERSHIP_ALREADY_EXISTS": "This account already has access to this item.",
+  "MEMBERSHIP_REQUEST_ALREADY_EXISTS": "This account has already requested a membership to the provided item.",
+  "MEMBERSHIP_REQUEST_NOT_FOUND": "Provided Membership Request not found."
 }