What is the correct way to write Excel UDF's so they work on Desktop, Web and Mobile Office - excel

With the introduction of Excel on Android and iOS, I'm not sure what's the correct method of creating a UDF (User Defined Function) that will work across all versions of the Office 365?
I want my UDF to work on iPad, Android as well as Desktop. What's the official Microsoft way of supporting all of these versions of Office for UDF's?

There is no way to support all these platforms. It will work on the Desktop editon of Office.

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Microsoft add-in doesn't work in excel desktop

I Have an add-in that is working on Excel in chrome, excel in Edge, but doesn't work in excel desktop.
Any clues?
Thanks
In the article amitklein gave, it says:
Office will still use the EdgeHTML base for add-ins until a build of Office 365 that supports Chromium is installed on the computer. We expect these builds to ship in 2020. They will likely appear in the Insiders channel in the first half of the year.
I haven't found the Chromium based Office 365 in insider channel so I think the version for now is still EdgeHTML based and Excel uses Edge Legacy.

Submit an add-in only for Excel Online

I want to submit an add-in only for Excel Online (no Excel for Mac, no Excel for Windows).
Could anyone tell me if it is possible and how to configure the manifest xml file?
The Office store requires that the add-in works for Mac, Windows and Online with optional iPad support. It is not possible to select only some of the required platform. The same code that works on one platform should also work on the other with the addition effort being in the testing area.

Can I use my VSTO & VBA excel addins with Office365?

All the questions/answers I have seen so far are old and do not provide a definitive answer.
Also what can I use locally and what can I use online?
what can I use locally and what can I use online?
You may use your VSTO and VBA add-ins for Office Desktop application on Windows.
Office applications on Web (online) has extensibility via Office.js API. Microsoft current name is "Office Add-ins", you may try them by loading into your Office application (excel) from Office Store. If you want to develop add-in based on this technology I would suggest to start over here: Office Add-ins platform overview. The conception behind of this technology is "build once, use everywhere where Office runs". That means your add-in may work for Office Desktop on Windows, Office Desktop on Mac, Online versions as well as some mobile platforms (subject to availability)

Example for Office Add-Ins for Mac?

I would like to develop Add-in for office Word for Mac (2011 and later). But I cannot find any manuals about Add-Ins development.
Can anybody know how to develop Add-Ins for Office for Mac?
It will be good if anybody suggest me link of Example. I have tried but didn't get any sample.
The good news is that you can use almost all the APIs documented here for MAC as well!
You also want to read this article about how to try your add-ins in MAC or iOS.
Finally make sure you are on the latest possible build! (15,22 as of right now).
Happy coding!!!
The process for building JavaScript add-ins for Mac is pretty much the same as building them for other platforms. There are some specific instructions for debugging on Mac.
However, Office Add-Ins for Mac are only supported starting with Office for Mac 2016 (and even then I believe it needs to be a recent update).

Disable access to the Visual Basic editor in Mac Office

I've been working intermittently on an Excel spreadsheet for a customer that does some pretty intense calculations. We implemented a security procedure using VBA... At first the requirements were relatively simple, and the overall lack of security in a spreadsheet was discussed and well understood.
Since then the customer has decided that he would like to have the sheet a bit more secure. Under normal circumstances I would simply disable the developer menu via code. Unfortunately I just recently found out that the customer, and many of his customers, are using Mac Office. (There are some customers that are even using 2008 and they found out the hard way that 2008 stopped supporting VBA)
My question is; is it possible to disable access to the Visual Basic editor in Mac Office in versions Pre 2008, and versions 2011 and after since from the research I've done so far points to a return of VBA support in Mac Office in 2011.
Unfortunately I do not have access to a Mac Office version to even really look through the application and or/test different solutions. In Windows it is possible to right click the VBA project and choose protection from the VBAProject Properties and choose "Lock project for viewing". Does this option exist and is it effective in Mac Office?
Any help/suggestions would be greatly appreciated.
I'm pretty sure you can lock projects in Mac Office the same way you can in Windows. Keep in mind that a project that has been locked in one version of Excel cannot be unlocked with a different version. So, if your customer needs to be able to unlock, they will need to use the same version of Excel you used to lock it.

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