Office Script shows a blank popup when launching a script from Excel Online

[iTTou]

Since Friday 26/09/2025 when launching a script from excel online that requires to show a dialong to accept user input the popup is appearing completely blank.
It's like excel is trying to open it on a new browser window that instanly closes (you can see said window flashing on the screen for a second).
This happens to all my collegues on multiple browsers (Chrome, Firefox, Edge).
The script still works fine when launcing it from Excel Desktop tho.

Steps to reproduce:

1. Create an excel script which requires user input on launch.
2. Launch int from excel online.
3. See another browser window flash for a split second leaving the popup of the script completely blank.

[GuilleAxpo]

Same issue here. We thought it could be because of an deleted enterprise app, as the sing in logs pointed to one that didn't exist any more, by the name of "Office Scripts". However, we didn't find the app having been soft deleted either.

[AlexJerabek]

Thanks for reporting this. @jeremy-msft, could you please investigate?

[GuilleAxpo]

The user facing the issue reports that it's working now.

[jeremy-msft]

Thanks @iTTou and @GuilleAxpo for reporting this issue. We were able to identify the problem and it has now been resolved. Please let us know if you continue to see further issues.