Dynamics Community Forum Thread Details

Timeout error immediately after sign-on in Excel dynamic workbook with D365 Add-in

Greetings,

My users have begun experiencing the following when opening up journals in Excel using the D365 Add-in (eg. create new vendor payment journal, go to lines, click on open in Excel). Normally, they would receive and open a dynamic Excel workbook. After opening, they would already be signed into D365 F&O and the workbook would refresh the data to show the latest in their workbook.

Now, they are being faced with the Sign-in screen as seen below:

When they click "Sign in", it opens a pop-up window like when you are trying to login with EntraId credentials, but it times out with the following:

The help link just goes to a generic Microsoft "timeout" error explanation, but doesn't provide any meaningful details. I'm not able to locate any available telemetry on my end with the sign-in attempt in App Insights. We were able to identify a work-around though, which is to sign-out within the D365 Excel Add-in, and then sign back in. This seems to have cleared whatever I'm assuming saved credentials were stored in Windows, and the EntraId sign-in window is now populating with a choice of user account to login with.

But now, every time a user opens a new workbook, or even a workbook they've saved on their local PC, it requires them to Sign-in. This is new behavior that wasn't seen before 5/1/2026. No new changes were introduced in either our Prod or UAT environments (where it is also happening). Sandbox has received the most recent released PQU for our version, but Prod has not yet been updated with it. We've recently upgraded to 10.0.47 on 4/17/2026.

The only thing that remotely coincides with when we first start seeing this behavior is our license renewal date was the same day, 5/1/2026. Now I'm not saying this is correlated, but it is the only thing that stands out to me. This isn't a major issue, of course, just a nuisance that my users are having to make one more click than they used to (I know... but it is changed behavior that I don't have an explanation for). I'm interested to see if anyone else has witnessed this, or if their dynamic workbooks have always opened with the user having to sign-in before getting data.

Current version details -

Application release: 10.0.47 (10.0.2527.42)

Platform release: PU71 (7.0.7858.27)

Anyways, thank you for your time.

Categories:

Dynamics 365 Finance

Hello,

You are not the only one experiencing this behavior. The same issue has been reported by other users following the May 1, 2026 update, as described in the following article:

https://www.linkedin.com/pulse/microsoft-dynamics-office-add-in-sign-in-issue-quick-fix-parag-chapre-ouo2e/

The root cause is related to an update in the Microsoft Authentication Library (MSAL), which can lead to timeout issues or sign-in loops.

The recommended workaround (also confirmed in the article) is: