Cannot uninstall add-in

[rexmortus]

Hi there,

Unfortunately, for whatever reason, this plugin does not work for me and now I can't send emails at all.

I also cannot remove the add-in:

You will note that I only have the option to "view details", not "Remove", like with many other add-ins.

Installing this add-in has completely bricked my outlook. Is there some reason why this particular add-in cannot be easily uninstalled? Is there another method for uninstalling this add-in?

Thanks,
Alec

[rexmortus]

This official Microsoft documentation says that I should be able to remove the add-in by going to the custom add-ins section and clicking remove:

Even stranger, this add-in doesn't appear here at all:

Any advice would be welcomed.

[eeyrsja]

I have the same issue. @rexmortus - did you manage to get your email account working again?

[eeyrsja]

I found a solution to removing it!

In powershell:

Step 1: Install the Exchange Online Management Module

To remove the add-in, first, ensure you have the Exchange Online Management Module installed.

1. Open PowerShell as an Administrator and run the following command to install the module:

   Install-Module -Name ExchangeOnlineManagement -Force

2. Once installed, import the module with:

   Import-Module ExchangeOnlineManagement

3. Connect to Exchange Online by running:

   Connect-ExchangeOnline -UserPrincipalName <your_email_address>

Step 2: List Installed Add-Ins

To identify the MarkOut add-in, list all the add-ins installed for your account:

Get-App | Format-Table DisplayName, AppId

This command will return a list of all installed add-ins with their respective DisplayName and AppId. Note down the AppId of MarkOut.

Step 3: Remove the Add-In

Once you have identified the AppId of MarkOut, use the following command to remove it:

Remove-App -Identity <AppId>

Replace <AppId> with the actual AppId. You will be prompted to confirm the removal; type Y to proceed.

Step 4: Verify Removal

To confirm MarkOut has been successfully removed, list the add-ins again using:

Get-App | Format-Table DisplayName

MarkOut add-in should no longer appear in the list.

Step 5: Wait

It can take up to 4 hours (in my experience) for the add-on to actually be removed.