Want to connect Slack and Microsoft Teams so your teams can message each other without switching apps? You've come to the right place.
This step-by-step guide covers everything you need to know about bridging Slack and Teams in 2025 — what's possible, what's not, and the fastest path to real bidirectional messaging sync.
Can Slack and Microsoft Teams Talk to Each Other Natively?
Short answer: No. As of 2025, Slack and Microsoft Teams have no native interoperability. There is no built-in way to send a message from Slack and have it appear in Teams (or vice versa) without a third-party integration layer.
Microsoft announced a Teams ↔ Slack channel connection feature in 2023, but it was limited in scope, heavily restricted, and was ultimately not broadly available to enterprise customers.
The production-ready solution is an enterprise interoperability platform like SyncRivo.
The 3 Common Approaches (And Why 2 of Them Fall Short)
Option 1: Guest Accounts ❌
Create guest accounts in Teams for Slack users (and vice versa).
Why it fails:
- Every Slack user needs a Teams license — expensive at scale
- Employees must constantly switch between apps
- IT has to manage two identity stacks
- Guest access creates compliance and data governance risks
Option 2: Email Forwarding or Bots ❌
Use a notification bot that emails important messages across platforms.
Why it fails:
- One-way only — no real bidirectionality
- Loses all context: threading, sender identity, file attachments
- Latency is minutes or hours, not milliseconds
- Not scalable beyond a handful of channels
Option 3: Messaging Interoperability Platform (SyncRivo) ✅
A dedicated API-to-API bridge that routes messages between Slack and Teams in real time.
Why it works:
- True bidirectional sync — messages flow in both directions
- Full fidelity — threading, sender names, files, @mentions preserved
- Sub-100 ms delivery latency
- SOC 2 Type II and HIPAA compliant
- No guest accounts, no app switching
How to Connect Slack and Microsoft Teams Using SyncRivo
Step 1: Sign Up for SyncRivo
Go to syncrivo.ai/pricing and select the plan that matches your organization size. Enterprise plans include dedicated onboarding support.
Step 2: Authorize Slack
In the SyncRivo dashboard:
- Click Add Platform → Slack
- Sign in with your Slack Workspace Admin account
- Grant SyncRivo the required OAuth scopes (read messages, post messages, manage channels)
Required Slack permissions:
channels:read,channels:history,chat:write,users:read
Step 3: Authorize Microsoft Teams
- Click Add Platform → Microsoft Teams
- Sign in with your Azure Active Directory admin account
- Grant admin consent for the SyncRivo Enterprise App in your tenant
Required Microsoft Graph scopes:
ChannelMessage.Read.All,ChannelMessage.Send,User.Read.All
This step requires Microsoft 365 Global Admin or Teams Service Admin permissions.
Step 4: Map Your Channels
In the SyncRivo dashboard, navigate to Channel Mappings:
- Select the Slack channel you want to sync (e.g.,
#engineering-general) - Select the Teams channel to pair it with (e.g.,
Engineering > General) - Choose sync direction: Bidirectional (recommended) or one-way
- Click Save & Activate
Repeat for each channel pair you want to bridge.
Step 5: Test the Connection
Post a test message in your Slack channel. Within a second, it should appear in the paired Teams channel — with your name displayed as the sender and any thread context preserved.
Send a reply from Teams. It should appear in Slack within the same sub-second window.
What Gets Synced Between Slack and Teams
| Element | Synced |
|---|---|
| Text messages | ✅ |
| Thread replies | ✅ |
| File attachments | ✅ (as links) |
| Sender name | ✅ |
| @mentions | ✅ (mapped) |
| Emoji reactions | ✅ |
| Message edits | ✅ |
| Message deletions | ✅ |
Compliance: Is This Secure?
Yes. SyncRivo uses a zero-persistence routing architecture — no message content is stored on SyncRivo servers. Messages are:
- Received from Slack Events API or Microsoft Graph webhook
- Processed and reformatted
- Delivered to the destination API
- Immediately discarded from SyncRivo's memory
Your data stays within your Slack and Microsoft tenant boundaries. SyncRivo is SOC 2 Type II certified and supports HIPAA-eligible workloads for healthcare organizations.
Ready to Connect Slack and Microsoft Teams?
You can be live in under 30 minutes. No engineering required. No migration. No guest accounts.
→ See the dedicated Slack to Microsoft Teams integration page → View SyncRivo pricing → Explore all features → Also read: The Complete Guide to Enterprise Messaging Interoperability → Also read: Slack vs Microsoft Teams Enterprise (2025 Comparison)
Written by SyncRivo Team · March 5, 2025
