Lots of #BUSY! errors

Question

I have an Add-in that I've developed for Excel online and Excel 2016 (e.g. a JavaScript add-in). It's worked fine up until last week. A lot of users have been complaining that they see #BUSY! when they try to use my custom formula. Sometimes, if they uninstall and reinstall the Add-in and close/reopen Excel it will work. In the online version of Excel I get a prompt everytime I open my sheet to click a button to "Trust this add-in". I haven't made any changes to the add-in for months and no reason on our end for this to occur. Was there an update on Excel's end that needs to be rolled back?

Answer 1

@Laptop User ,
Welcome to Q&A forum!

According to your description, this issue is related to third-party Add-ins that is not supported in Q&A currently.
Thanks for your understanding!

Personally, I found the following official articles about the error #BUSY, pelase check them out.
Troubleshoot custom functions
How to correct a #BUSY! error

Hope the information is helpful to you.

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Answer 2

To the contrary: this is clearly an issue with an Excel update since we haven't made any updates for quite some time. The fact that I have to manually click a button to trust the Add-in everytime I use it at office.com and that you get different behavior on desktop makes it clear it is a problem with Excel and not the add-in.

Answer 3

I should add that on the desktop version the issue is fixed if the users uninstalls the add-in, installs it again and restarts excel. So, the problem is not with the add-in itself.

Answer 4

How do we update the version for the web?

Answer 5

Now we have users reporting "This add-in is no longer supported on this application". They are using Excel version 2019.