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Since your question tittle is in English , I’ll reply in this language as well. If you’re more comfortable using another language, please let me know, I’ll be happy to tailor my response to your preferred language.

Hello @Chun_Lam,

Thank you for sharing the error message.

Based on the details provided, the error “Microsoft.Exchange.Data.Storage.TenantAccessBlockedException” typically indicates that access to the Microsoft 365 tenant has been restricted at the service level. This is not a client- or device-specific issue, but rather something affecting the entire tenant or Exchange Online service.

Because this restriction is applied at the tenant level, I recommend contacting Microsoft Support so they can assist with unblocking the tenant. Please note that this must be handled by your tenant administrator:

1. Find your Microsoft 365 admin: If you are unsure who the Global Administrator is in your organization, you can refer to this guide: How can I find my Microsoft 365 admin?
2. Submit a service request: The Global Administrator should create a support request with Microsoft for further investigation: Get support - Microsoft 365 admin
3. If your subscription is managed by a partner or reseller: Please contact your provider so they can assist in raising a support request on your behalf.

I sincerely apologize for redirecting you to Microsoft Support. As this issue involves tenant-level access restrictions, it requires backend checks and actions that are not accessible from the forum.

Thank you for your understanding, and please feel free to let me know if you need any further assistance.

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