diff --git a/conversations/v2/openapi.yaml b/conversations/v2/openapi.yaml
index 3c207da1..e97a13bc 100644
--- a/conversations/v2/openapi.yaml
+++ b/conversations/v2/openapi.yaml
@@ -994,7 +994,7 @@ components:
             ]
             title: Constraint Violation
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema:
diff --git a/conversations/v2/sms.yaml b/conversations/v2/sms.yaml
index 6a3f77ce..6feda21f 100644
--- a/conversations/v2/sms.yaml
+++ b/conversations/v2/sms.yaml
@@ -149,7 +149,7 @@ components:
             ]
             title: Constraint Violation
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration (Phone Number) that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema:
diff --git a/conversations/v2/viber.yaml b/conversations/v2/viber.yaml
index a19a23ef..8a40d741 100644
--- a/conversations/v2/viber.yaml
+++ b/conversations/v2/viber.yaml
@@ -165,7 +165,7 @@ components:
             ]
             title: Constraint Violation
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration (Viber Service ID) that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema:
diff --git a/conversations/v3/common.yaml b/conversations/v3/common.yaml
index 311ca6e3..8615fee1 100644
--- a/conversations/v3/common.yaml
+++ b/conversations/v3/common.yaml
@@ -330,7 +330,7 @@ components:
             ]
             title: Constraint Violation
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema:
diff --git a/conversations/v3/openapi.yaml b/conversations/v3/openapi.yaml
index bb2a3c25..8b927d39 100644
--- a/conversations/v3/openapi.yaml
+++ b/conversations/v3/openapi.yaml
@@ -73,7 +73,7 @@ components:
             title: Constraint Violation
 
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema:
diff --git a/conversations/v3/sms.yaml b/conversations/v3/sms.yaml
index e4bfb038..6b2aa07e 100644
--- a/conversations/v3/sms.yaml
+++ b/conversations/v3/sms.yaml
@@ -187,7 +187,7 @@ components:
             ]
             title: Constraint Violation
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration (Phone Number) that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema:
diff --git a/conversations/v3/telegram.yaml b/conversations/v3/telegram.yaml
index eaf4f669..7c246656 100644
--- a/conversations/v3/telegram.yaml
+++ b/conversations/v3/telegram.yaml
@@ -180,7 +180,7 @@ components:
             ]
             title: Constraint Violation
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration (Telegram ID) that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema:
diff --git a/conversations/v3/viber.yaml b/conversations/v3/viber.yaml
index 332c9d46..329e5c03 100644
--- a/conversations/v3/viber.yaml
+++ b/conversations/v3/viber.yaml
@@ -194,7 +194,7 @@ components:
             ]
             title: Constraint Violation
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration (Viber Service ID) that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema:
diff --git a/conversations/v3/wechat.yaml b/conversations/v3/wechat.yaml
index 33fc578c..13fdfde4 100644
--- a/conversations/v3/wechat.yaml
+++ b/conversations/v3/wechat.yaml
@@ -218,7 +218,7 @@ components:
             ]
             title: Constraint Violation
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration (WeChat ID) that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema:
diff --git a/conversations/v3/whatsapp.yaml b/conversations/v3/whatsapp.yaml
index aa9455a0..32f11ada 100644
--- a/conversations/v3/whatsapp.yaml
+++ b/conversations/v3/whatsapp.yaml
@@ -873,7 +873,7 @@ components:
             ]
             title: Constraint Violation
     Forbidden:
-      description: You attempting to use a number that is not assigned to your account
+      description: You are attempting to use a sender configuration (WhatsApp Business Account Phone Number) that is not assigned to your tyntec account
       content:
         application/problem+json:
           schema: