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Connect to O365 Sharepoint

In this article:

Step 1: Create the App in Microsoft Entra #

  • Go to: Microsoft Entra App Registrations
  • Login as MS Office 365 admin
  • Click on Applications > App registrations – from the left hand menu, if not already selected.
  • Click “+ New registration”
  • Name: It can be anything, but we recommend, Seamlss SharePoint
  • Supported account type: Accounts in this organizational directory only (Single tenant)
  • Redirect URI:
    • Select Web from the dropdown
    • URI: https://seamlss.app/Settings/SharePointCallback
  • Click Register
  • dd
  • Once completed, take note of the Application (client) ID, along with your Directory (tenant) ID. These will be used later.

Step 2: Configure Authentication Settings #

  • Go to the app’s Authentication menu
  • Confirm Web platform is configured correctly.
    • This should already be configured, but otherwise click “Add a platform”, select “Web” and for Redirect URI enter: https://seamlss.app/Settings/SharePointCallback
  • Set the following for Front-channel logout URL: https://seamlss.app/Settings/DisconnectFromSharePointAsync
  • Under Implicit grant and hybrid flows, tick both boxes.
  • Finally, for Supported account types select “Accounts in this organizational directory only (_Your org_ – Single tenant)”.
  • Leave Advanced settings as-is, and click Save

Step 3: Generate a Client Secret #

  • Navigate to Certificates & secrets
  • Under “Client secrets,” click + New client secret
    • Description: Seamlss SharePoint Client Secret
    • Expiry: 6 to 24 months recommended
  • Click Add and copy the VALUE immediately (you won’t be able to retrieve it again later)

Return to the Seamlss SharePoint integration page and paste the Client Secret into the Client Secret ID field. You can also copy and paste the Tenant ID and Application ID / Client ID at this stage if you like.

Step 4: Add Delegated API Permissions #

Go to API Permissions > + Add a permission > Microsoft Graph > Delegated permissions

  • Add the following: (use the search bar to find them quickly and easily)
    • Files.ReadWrite.All
    • Sites.Read.All
    • offline_access

You should see the permissions added like below (User.Read will already be added).

After adding the permissions, click Grant admin consent:

The Status should then say Granted for each permission. Your Application setup is now complete.

Step 5: Connect in Seamlss #

Return to the Overview menu to copy the required fields below.

Now go to Seamlss to complete the connection:

  • Go to the SharePoint integration setup section
  • Enter the following values:
    • Directory (tenant) ID => Tenant ID
    • Application (client) ID => Application ID / Client ID
    • Client Secret => Client Secret ID (from Step 3) if you didn’t you will have to go back and create another
  • Click Connect to SharePoint, follow the prompts to sign in as admin, ensuring you tick the Consent box and Accept.
  • Once authenticated, use the Select SharePoint Drive button to select a site and documents folder (e.g. Business Edge Accounting > Documents)
  • Click the Save Settings button to finish.

Notes #

  • Connecting SharePoint will disconnect any previous OneDrive or Google Drive integration.
  • The Microsoft Entra app must be registered under the same tenant as the user’s Microsoft 365 account used for connection.
  • Ensure “Web” is explicitly selected when entering Redirect URIs — this is easy to miss.

Troubleshooting #

Redirect URI Mismatch #

Ensure the redirect URI in Microsoft Entra exactly matches the one used by Seamlss:

  • https://seamlss.app/Settings/SharePointCallback

If not, add it under Authentication > Platform configurations and save.

Secret Errors #

  • Ensure the secret value is used (not the secret ID)
  • If unsure, generate a new one and replace it in Seamlss

Consent Issues #

  • Admins must click Grant admin consent in the Azure portal
  • If it fails silently, confirm that each permission shows “Granted” next to it

Login or Sync Fails #

  • Clear cookies or try an incognito window
  • Ensure the user connecting via Seamlss belongs to the same Microsoft 365 tenant where the app was registered
  • Refresh the client secret or tenant/client ID values in Seamlss if they’ve changed

What Not to Do #

  • ❌ Don’t use Application-type permissions
  • ❌ Don’t register the app as multi-tenant
  • ❌ Don’t use wildcard (*) URIs
  • ❌ Don’t forget to select “Web” when configuring Redirect URIs
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