Office Add-ins developer platform community call – October 8, 2025

Office Add-ins developer platform community call – October 8, 2025

Office Add-ins developer platform community call - October 8, 2025

This month’s agenda and presenters

  • Changes to inline image representation in Outlook on the web and new Outlook for Windows Arpit Sangwan, Software Engineer at Microsoft.

View video segments

Resources related to this blog’s content

Changes to inline image representation in Outlook

Documentation updates General

Developer experience

Excel

Nested app authentication (NAA) and legacy token deprecation

Outlook

PowerPoint

Word

Q&A (Question & Answers)

Note that there are still some questions we are tracking down answers for and we will post them here soon, or follow up on the next community call during the Q&A session.

Is there any updated on the ability for Smart Alerts to be supported in Outlook mobile?

It’s something that’s on our radar and we expect work on this to start soon. It’s a large, complex piece of work on Outlook mobile, so we do not have a definitive ETA yet. But the work is in progress to enable Smart Alerts on Outlook Mobile.

**The item change event in Outlook works in classic but on OWA and new Outlook it doesn’t fire consistently. For details, see https://learn.microsoft.com/en-us/answers/questions/5537293/itemchanged-event-not-triggered-sometimes-on-chang?comment=answer-12261379&page=1#comment-2249453 and https://github.com/OfficeDev/office-js/issues/6101 **

We have someone looking into this and we’ll share more updates on the GitHub issue once we are able to reproduce the problem.

What is the best place to ask about updates on issues/feature requests (I have the office bug#)?

If there is a bug with Office.js APIs or Office Add-ins, please create an issue at https://github.com/OfficeDev/Office-js.

events around named items in Excel. The Excel-specific beta version of office.js has support for events around named items in Excel (see https://appsforoffice.microsoft.com/lib/beta/hosted/excel.js) for years, but it has not been added into the office.js build. Is there a specific reason?

We looked into this and decided we’ll work to include them in the next Excel Requirement set (likely 1.21). Thanks for bringing this to our attention!

I have a couple question related to unified manifest support with a Word add-in. First, is it possible to open a new add-in from Copilot? Second, can we add custom buttons, similar to the existing Insert button, with our own functionality?

  • Yes, it’s possible to combine a Copilot agent and an add-in in the same unified manifest package
  • No, it’s not possible today to open an add-in from an agent directly. Add-in actions are callable by an agent, but switching to an add-in taskpane isn’t supported.
  • The ‘insert’ button used in an agent is provided as an agent feature outside of the add-in. We’re investigating allowing responses from an agent to directly call an add-in action vs having the agent choose to use on based on the user query.

Call to action

General Resources

Stay connected