Hi Xingyu,
Thank you for reaching out. My name is Furkaan, a user just like you. I’d be happy to help you with your concerns. It seems there might be an issue with how your home Wi-Fi network interacts with Microsoft Teams or SharePoint (where Teams files are stored). Here are some steps you can try to troubleshoot the problem:
Check Your Home Wi-Fi Settings: Restart your Wi-Fi router and modem. Sometimes a simple restart can fix temporary glitches. Ensure your Wi-Fi network doesn't have any content filtering or parental controls that might be blocking access to SharePoint or Teams servers. Verify Teams Service Health: Visit the Microsoft Service Health portal (https://learn.microsoft.com/en-us/microsoft-365/enterprise/view-service-health?view=o365-worldwide) and check for any ongoing issues with Teams or SharePoint. Flush DNS Cache: Flushing your DNS cache can help if outdated information is causing connection problems. Search online for instructions specific to your operating system (Windows, Mac etc.) on how to flush the DNS cache. Change DNS Servers: Try temporarily switching to a public DNS server like Google DNS (8.8.8.8 & 8.8.4.4). Look up instructions on how to change DNS servers for your device/operating system. Contact Your Internet Service Provider (ISP): If none of the above solutions work, there might be an issue with your ISP that's blocking access to specific Microsoft services. Contact your ISP's support team and explain the situation.
I hope I can find a satisfactory solution to your problem. If you have any additional questions or concerns, please don’t hesitate to reach out. Best Regards, Furkaan