diff --git a/types/office-js-preview/index.d.ts b/types/office-js-preview/index.d.ts
index 1c5a92ff13..d12ee44e5c 100644
--- a/types/office-js-preview/index.d.ts
+++ b/types/office-js-preview/index.d.ts
@@ -9100,6 +9100,10 @@ declare namespace Office {
          *
          * You can subsequently use the identifier with the removeAttachmentAsync method to remove the attachment in the same session.
          *
+         * **Important**: In recent builds of Outlook on Windows, a bug was introduced that incorrectly appends an `Authorization: Bearer` header to
+         * this action (whether using this API or the Outlook UI). To work around this issue, you can try using the `addFileAttachmentFromBase64` API
+         * introduced with requirement set 1.8.
+         *
          * [Api set: Mailbox 1.1]
          *
          * @remarks
@@ -9133,6 +9137,10 @@ declare namespace Office {
          *
          * You can subsequently use the identifier with the removeAttachmentAsync method to remove the attachment in the same session.
          *
+         * **Important**: In recent builds of Outlook on Windows, a bug was introduced that incorrectly appends an `Authorization: Bearer` header to
+         * this action (whether using this API or the Outlook UI). To work around this issue, you can try using the `addFileAttachmentFromBase64` API
+         * introduced with requirement set 1.8.
+         *
          * [Api set: Mailbox 1.1]
          *
          * @remarks
@@ -13263,6 +13271,10 @@ declare namespace Office {
          *
          * You can subsequently use the identifier with the removeAttachmentAsync method to remove the attachment in the same session.
          *
+         * **Important**: In recent builds of Outlook on Windows, a bug was introduced that incorrectly appends an `Authorization: Bearer` header to
+         * this action (whether using this API or the Outlook UI). To work around this issue, you can try using the `addFileAttachmentFromBase64` API
+         * introduced with requirement set 1.8.
+         *
          * [Api set: Mailbox 1.1]
          *
          * @remarks
@@ -13298,6 +13310,10 @@ declare namespace Office {
          *
          * You can subsequently use the identifier with the removeAttachmentAsync method to remove the attachment in the same session.
          *
+         * **Important**: In recent builds of Outlook on Windows, a bug was introduced that incorrectly appends an `Authorization: Bearer` header to
+         * this action (whether using this API or the Outlook UI). To work around this issue, you can try using the `addFileAttachmentFromBase64` API
+         * introduced with requirement set 1.8.
+         *
          * [Api set: Mailbox 1.1]
          *
          * @remarks
diff --git a/types/office-js/index.d.ts b/types/office-js/index.d.ts
index e1f64bdd52..4f7dbc51d2 100644
--- a/types/office-js/index.d.ts
+++ b/types/office-js/index.d.ts
@@ -9005,6 +9005,10 @@ declare namespace Office {
          *
          * You can subsequently use the identifier with the removeAttachmentAsync method to remove the attachment in the same session.
          *
+         * **Important**: In recent builds of Outlook on Windows, a bug was introduced that incorrectly appends an `Authorization: Bearer` header to
+         * this action (whether using this API or the Outlook UI). To work around this issue, you can try using the `addFileAttachmentFromBase64` API
+         * introduced with requirement set 1.8.
+         *
          * [Api set: Mailbox 1.1]
          *
          * @remarks
@@ -9038,6 +9042,10 @@ declare namespace Office {
          *
          * You can subsequently use the identifier with the removeAttachmentAsync method to remove the attachment in the same session.
          *
+         * **Important**: In recent builds of Outlook on Windows, a bug was introduced that incorrectly appends an `Authorization: Bearer` header to
+         * this action (whether using this API or the Outlook UI). To work around this issue, you can try using the `addFileAttachmentFromBase64` API
+         * introduced with requirement set 1.8.
+         *
          * [Api set: Mailbox 1.1]
          *
          * @remarks
@@ -13076,6 +13084,10 @@ declare namespace Office {
          *
          * You can subsequently use the identifier with the removeAttachmentAsync method to remove the attachment in the same session.
          *
+         * **Important**: In recent builds of Outlook on Windows, a bug was introduced that incorrectly appends an `Authorization: Bearer` header to
+         * this action (whether using this API or the Outlook UI). To work around this issue, you can try using the `addFileAttachmentFromBase64` API
+         * introduced with requirement set 1.8.
+         *
          * [Api set: Mailbox 1.1]
          *
          * @remarks
@@ -13111,6 +13123,10 @@ declare namespace Office {
          *
          * You can subsequently use the identifier with the removeAttachmentAsync method to remove the attachment in the same session.
          *
+         * **Important**: In recent builds of Outlook on Windows, a bug was introduced that incorrectly appends an `Authorization: Bearer` header to
+         * this action (whether using this API or the Outlook UI). To work around this issue, you can try using the `addFileAttachmentFromBase64` API
+         * introduced with requirement set 1.8.
+         *
          * [Api set: Mailbox 1.1]
          *
          * @remarks