UPDATE 2/21:
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Version 2403 (Build 17404.20000)
Security updates listed here
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Microsoft 365 Insider Beta Channel v2403 build 17419.20000 - Feb. 21
Microsoft 365 Insider: Version 2403 (Build 17419.20000) Resolved issues Excel We fixed an issue that caused errors when attempting to save files in environments where Default Labeling and Mandatory Labeling policies are configured and AIP document co-authoring is disabled. We fixed an issue...

Microsoft 365 Insider:
Version 2403 (Build 17404.20000)
Security updates listed here
Feature updates
OneNote
- Preview of New Sticky Notes app on Windows available from OneNote app: The new Sticky Notes app allows you to create and recall notes like the classic Microsoft Sticky Notes app, while making it easier to capture screenshots, automatically add the source information to the notes, and more.
Resolved issues
Excel
- We fixed an issue where attempting to programmatically set the Formula property on a Linked Picture resulted in a run-time error.
OneNote
- We fixed an issue where, after switching from an ODM notebook to an ODP notebook with the notebooks pane pinned, the Math Assistant continued to appear in the Draw tab and prompted an error.
Outlook
- We fixed an issue with user and shared mailboxes where a message sent from a user with saved to Sent Items folder enabled and where DelegateSentItemsStyle is set to 1 is saved in the shared mailbox Sent Items folder.
- We fixed an issue that caused expanded groups in the message list to become collapsed when changing which column they are arranged by.
- We fixed an issue where a Meeting window would not close and the meeting would not get added to the organizer's calendar if an image had previously been added into the body of the message and the organizer was attempting to reopen the meeting and add new attendees.
Word
- We fixed an issue where the default font Yu Mincho Demibold would change to Yu Gothic when the user moved to the next line.
- We fixed an issue where pasting a list with a custom style into a document that was saved to the cloud with restricted formatting would show an "AutoSave Failed" error.
- We fixed an issue where the error message “Compile error” would appear when opening a .docm file.
Source:
- Release Notes for Beta Channel - Office release notes
- Update History for Office Beta Channel - Office release notes

Latest Office and Microsoft 365 Updates for Windows
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