How to fix : "Synchronization isn’t available right now. We’ll try again shortly." Microsoft teams

Hi @MELLA LUIS ALEJANDRO, 

Thank you for the detailed information. Since this issue occurs in both the Teams desktop app and Teams on the web, and it is affecting multiple users, it would be helpful to gather a bit more information to narrow down the cause. 

Could you please confirm: 

• Does the error appear only when accessing the Teams calendar, or does it affect other Teams features as well? 
• Can the affected users access their mailbox and calendar successfully in Outlook on the web (OWA)? 

As an initial troubleshooting step for the Teams desktop app, please try repairing Teams: 

1. Close Microsoft Teams completely. 
2. Open Settings > Apps > Installed apps (or Apps & Features on Windows 10). 
3. Find Microsoft Teams in the list. 
4. Select the three dots (...) next to Teams and choose Advanced options. 
5. Select Repair and wait for the process to complete. 
6. Reopen Teams and test again. 

If the issue persists, please also try: 

1. In the same Advanced options page, select Reset. 
2. Sign out of Teams and sign back in. 
3. Test whether the calendar loads correctly afterward. 

Please let us know the answers to the questions above, as they will help determine whether this is a client-side Teams issue or a broader Exchange Online / calendar synchronization issue. 

Thank you for your patience and understanding. I look forward to your update. 

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Multiple users on Windows 10 report that Microsoft Teams shows the message ‘Synchronization isn’t available right now. We’ll try again shortly.’ The issue occurs in the Teams app and in the Teams web experience, specifically when accessing the Calendar area. It is not related to Planner.Troubleshooting already attempted

• Restarted Teams / refreshed the desktop session (including banner refresh when available)
• Fully quit and reopened Teams from the Windows taskbar notification area
• Reloaded the Teams web page
• Signed out and signed back in
• Verified basic internet connectivity by opening other websites
• Ensured Teams is updated and checked for updates again
• Avoided switching networks while using Teams (when applicable)

Impact / scope Affects multiple users (not limited to a single device). Both desktop app and web show the same error message, triggered when using Calendar.

Additional notes Because the issue impacts both app and web and affects multiple users, we suspect a service/network/tenant-side issue. Please advise next steps.