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As title indicates, my add on is failing to sideload. I am trying to follow the official tutorial of microsoft on how to build your first outlook, developing a taskpane: https://learn.microsoft.com/en-us/office/dev/add-ins/quickstarts/outlook-quickstart?tabs=yeomangenerator

I followed this tutorial down to the last letter but I am getting the same error. Basically after I set up my project, and I chose the language and name for my add on, I run the npm start from my vs code terminal, then I am being prompted to microsoft login portal, I sign up and then back to my vs code terminal I get 401..

I have my microsoft exchange account connected to outlook and it works, so I know thats not the issue..if anyone could help me I would appreciate it!

Here is the error:

Successfully registered package! (??) STDERR: (×) Error: [Login] Failed to retrieve token silently. If you encounter this problem multiple times, you can delete C:\Users\Benjamin Agic\.fx\account and try again. invalid_scope: 70011 - [2024-02-19 08:17:50Z]: AADSTS70011: The provided value for the input parameter 'scope' is not valid. The scope 'https://dev.teams.microsoft.com/AppDefinitions.ReadWrite openid profile offline_access' does not exist. Trace ID: fbf8f4fb-e2bb-4a2c-83d8-07c3ec040800 Correlation ID: d3d06969-78ae-4ba1-be44-85e4c4b3239c Timestamp: 2024-02-19 08:17:50Z - Correlation ID: d3d06969-78ae-4ba1-be44-85e4c4b3239c - Trace ID: fbf8f4fb-e2bb-4a2c-83d8-07c3ec040800 (×) Error: Sideloading failed. (×) Error: {"statusCode":401,"message":"Unauthorized"} (×) Error: m365.UnhandledError: An unexpected error has occurred while performing the M365 task. {"stack":"Error: {"message":"Request failed with status code 401","detail":"{\"statusCode\":401,\"message\":\"Unauthorized\"}","tracingId":""}\n at createError (C:\Users\Benjamin Agic\Desktop\Plugin\SheildIT\node_modules\@microsoft\teamsfx-cli\lib\index.js:14:300960)\n at settle (C:\Users\Benjamin Agic\Desktop\Plugin\SheildIT\node_modules\@microsoft\teamsfx-cli\lib\index.js:14:305240)\n at IncomingMessage.handleStreamEnd (C:\Users\Benjamin Agic\Desktop\Plugin\SheildIT\node_modules\@microsoft\teamsfx-cli\lib\index.js:14:290544)\n at IncomingMessage.emit (node:events:530:35)\n at endReadableNT (node:internal/streams/readable:1696:12)\n at process.processTicksAndRejections (node:internal/process/task_queues:82:21)","message":"{"message":"Request failed with status code 401","detail":"{\"statusCode\":401,\"message\":\"Unauthorized\"}","tracingId":""}","config":{}}

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  • Do you get any errors when you sideload add-ins manually? Commented Feb 19, 2024 at 20:44
  • For some reason I can't sideload manually, I tried following the tutorial on that but I just dont see that window which they have in picture of tutorial, here is tutorial: learn.microsoft.com/en-us/office/dev/add-ins/outlook/… Instead when I click get add ins I get redirected to microsoft store where I can browse and add addins.. Commented Feb 20, 2024 at 7:40
  • Related stackoverflow.com/questions/78008528/… Commented May 21, 2024 at 3:30

3 Answers 3

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The error message states that you are not authorized in Office 365 to sideload the add-in:

Error: Sideloading failed. (×) Error: {"statusCode":401,"message":"Unauthorized"} (×) Error: m365.UnhandledError: An unexpected error has occurred while performing the M365 task.

You may try to sideload the add-in manually, see Manually sideload an add-in to Office on the web for more information.

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2 Comments

So the thing I am confused at is the fact that I am authorized..like when I get prompted to sign in after I do npm start the window says you are now authenticated and may close this window, but then back in my terminal I get that error..and for the life of me I cant figure out why, could there be perhaps a some kind of restriction on outlook account or something? I also noticed that in my cache from .fx folder the json file which contains token i empty, could it be thats what causing this? Also link that you provided is not for outlook :/
@beni14 the issue is that the output doesn't tell you the real problem. You have to use a business account for this to work. They say you can get a free one, but when signing up it tells you that you're no eligible, so at the end of the day you need to buy a business account to develop with.
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I've opened an issue about this in their github, but the solution is to use a Microsoft 365 Business account. If you can log into outlook.office.com then you have the correct type of subscription.

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Could you enhance the answer by adding the link to your GitHub issue?
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Prerequisites

You need to have an active Microsoft 365 Business Standard or Microsoft 365 Business Premium subscription. Note, you can get 1 month for free.

While acquiring the subscription, you will be prompted to create an onmicrosoft.com account.

Therefore, after successfully acquiring the subscription for [email protected] you will have two accounts (note, alice, bob, mycompany are just example placeholder names):

Correct login procedure

In Outlook, you need to be logged in with

In the pop-up window, you need to log in with

Incorrect login procedure

If you instead try to use [email protected] in the pop-up window, you'll get the Unauthorized 401 error

invalid_scope: 70011 - [2024-05-21 03:15:44Z]: AADSTS70011: The provided value for the input parameter 'scope' is not valid. The scope 'https://dev.teams.microsoft.com/AppDefinitions.ReadWrite openid profile offline_access' does not exist. Trace ID: [...] Correlation ID: [...] Timestamp: 2024-05-21 03:15:44Z - Correlation ID: [...] - Trace ID: [...]
(node:79101) [DEP0044] DeprecationWarning: The `util.isArray` API is deprecated. Please use `Array.isArray()` instead.
(✖) Error: Sideloading failed.
(✖) Error: {"statusCode":401,"message":"Unauthorized"}
(✖) Error: m365.InternalError: {"message":"Request failed with status code 401","detail":"{\"statusCode\":401,\"message\":\"Unauthorized\"}","tracingId":""}
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