Microsoft Excel Notification from Add-on - excel

I am building an add-on for Microsoft Excel. I would like to see a notification popping up displaying name of the company whenever the add-on is added to MS Excel.
I tried using xlcAlert, But it demands user interaction (The user needs to click "OK").
I would like to use some banner, which comes for a second or two and then banishes away.
Please guide for the same.

How about a form which loads when the add-in does, and then unloads after a set interval?

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How to show Taskpane selected data in ribbon command using officejs

We are populating list of users in dropdown list Task pane UI. When we are selecting the user in the list we were able to show selected user in taskpane itself.
Also we wanted to show the selected user in ribbon command Menu like in attached screen shot.
The screen shot which took from Excel DNA with .net application the same wanted to achieve in Excel add-in using OfficeJS.
The Fluent UI extensibility level leaves much to be a desire for Web add-ins. See Add-in commands for Excel, PowerPoint, and Word for more information.
If you need to implement dynamic ribbon customizations you need to consider developing a VSTO based add-in instead.
this feature is not yet available with add-in commands. One capability we just announced on the community call was "contextual tabs api". This will be available soon for public preview where you will be able to test it. Please stay tuned for our next community call for an update.

Custom Ribbon tab missing in Excel

I tried searching for this question but couldn't really find a similar problem.
I have an excel file in which I created a custom ribbon tab and made copies of this file.
Image of the tab
In some of those copies, the tab has gone missing. I was earlier using Excel 2016 and recently migrated to Microsoft 365 and downloaded the latest version of Office. I am not sure if this is causing the problem since some files do still have the custom ribbon.
Thanks a lot for your help in advance.
Regards
Do you get any UI errors when the tab is missed?
By default, if an add-in attempts to manipulate the Microsoft Office user interface (UI) and fails, no error message is displayed. However, you can configure Microsoft Office applications to display messages for errors that relate to the UI. You can use these messages to help determine why a custom ribbon does not appear, or why a ribbon appears but no controls appear.
To show VSTO Add-in user interface errors you need:
Start the application.
Click the File tab.
Click Options.
In the categories pane, click Advanced.
In the details pane, select Show VSTO Add-in user interface errors, and then click OK.
If you deal with documents with embedded customizations, make sure the protected mode is off when the document is opened. See What is Protected View? for more information.

Auto-open does not work for people who have not signed in in browser

I want to share a document online by a URL with some colleagues. When they click the URL and view the document online, I want a task-pane add-in to be automatically opened.
I used Office-OOXML-EmbedAddin to create such a file with Script Lab auto-opened, then I put the file (view-only) on my OneDrive:
https://1drv.ms/x/s!AmAcI5jpNEmng1NhS0xbIMcUnUNZ
However, our tests show that, for people who have not signed in with Microsoft Account in their browser, the auto-open does NOT work, though they can view the document.
Is this behavior expected, given that people may not stay signed in all the time?
PS: note that if people download the document, they don't need to sign in to enable auto-open in Excel desktop.
This is a known bug. Until it is fixed, users will have to be logged in when they open a document on OneDrive in order for the autoopen feature to work. Sorry for the bad news, but it is on Microsoft's radar and we know it is important.

Launch one addin from another addin in excel

We have developed a couple of excel addins with office-js and are finding that it would be really handy to be able to launch one addin from another addin and even possibly pass some data between the 2. Is the launching at least possible?
If you own both add-ins, you could navigate to one or the other via the URL's you placed in your manifest file. This could allow you to launch another add-in, however it would be inside the same task pane.
You could also pass data between both apps via url query parameters.
I've done this before when I made an add-in that was a landing page for other add-ins. When you clicked on a button for another tool, it would navigate to another add-in (which was a separate project) and pass the previous tool as a parameter in the URL so you could navigate back to where you came from.
It'd also be possible to share data on a private sheet inside Excel.
This would be security issue when an add-in will be able to manipulate others. For this obvious reason this is not possible.
Usually I advise to use https://officespdev.uservoice.com/ to request unimplemented feature, but based on your description, Office team most likely won't allow it anyway.

Possibilities of MS Outlook Web Add-ins on the header/Ribbon in web apps and Independent

I am working with outlook Web-Addins. Addin type is "ItemRead". Now I want some thing unrelated to mails as in i want to have button on header as i see the skype button on the top.
Also we can create Addin on mail compose. I am not sure if this is possible to have separate buttons on header separate from mail section
example in the image of skype button.
I have also tried with Outlook Add-in ModuleExtension but cannot seems to be work as expected in outlook web app.
The command controls for invoking add-on are described in manifest part of the add-in. Those controls will be displayed in predefined place of the UI depend on particular client design (Outlook online, Outlook desktop, etc.). As the developer you are able to set control's setting, such as title, icon and so on, but not the place where control will be displayed. This would be up to Microsoft dev/design team.
Bottom line: You are not able to place your control in the specific place of the client interface.
Module extension add-in currently available for Outlook 2016 desktop. There is request to make it available for Outlook online which you can upvote if you like.
Additional Questions:
So is it is not possible right right now?
Module extension add-in for Outlook online is not currently available. To place your control into the place you want is not available, either and never will be. This is because of obvious reasons ... can you imagine what's happen with user interface if every extension will be able to modify the UI as it needs? Total disaster.
Or can you help me with other option ?
Outlook add-in works with single item, as of the controls will appear when item (e-mail, appointment, etc.) selected or compose window invoked, there is nothing you can do.
Also one more thing that is it possible to store a custom global setting value for the outlook organization using addin or any other way?
To store the settings for particular mailbox, user inside organization, there is Office.context.roamingSettings object. If you need some global settings for your app for entire organization, you would set them inside JS part for this particular organization and make the deployment just withing this organization. In case you want to distribute the app via Office store and customize it per organization you may want to write some service which delivers custom settings for add-on on start-up. For example you have rest service which returns custom configuration depend on domain; in this case when add-on invoked you may request custom configuration by sending rest call with user domain and after cache it in mailbox.

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