trying to log in but says no internet access

Try these checks in order:

1. Check for a Windows update first Some Office sign-in issues that report no internet access were fixed by a Windows update. Go to Start > Settings > Windows Update > Check for updates, install all available updates, and restart the PC.
2. If using a wired Ethernet connection, test Wi-Fi A known cause is an incompatible network card driver or the IPv4 Checksum Offload feature on wired LAN connections. This issue can show No Internet Access on Ethernet while Wi-Fi works.
   • If possible, connect by Wi-Fi and try signing in again.
   • If Wi-Fi works, update the network card driver.
3. Update the network card driver Use Windows Update first. If no driver update appears there, get the latest driver from the network card manufacturer’s support/download site.
4. If the problem is only on Ethernet, disable IPv4 Checksum Offload This can be a temporary workaround.
   • Open Control Panel
   • Open View network connections
   • Right-click the network adapter and select Properties > Configure
   • Open the Advanced tab
   • Select IPv4 Checksum Offload and set it to Disable
   • Select OK
5. Remove extra Office/work-school sign-in entries If more than one account is signed in on the device, sign out of all Office apps. Then go to Settings > Accounts > Email & accounts and remove extra work or school accounts. Next, open Control Panel > Credential Manager > Windows Credentials and delete Office-related entries. Restart the PC, open Word or Excel, and sign in again with the correct account.
6. If this is a work or school account, check access requirements Access can be blocked if:
   • the device is not connected to the organization network
   • two-factor authentication is required but not completed
   • the device is not domain joined
   • the device is not trusted
7. For Outlook specifically, make sure Office can connect to the internet If the Allow Office to connect to the Internet option is unavailable, it can be controlled by the UseOnlineContent registry setting or Group Policy. If the setting is managed under policy, an administrator must change it.

If the issue is only in Outlook on Mac, also verify Outlook > Work Offline is not selected and confirm the Exchange account settings are correct.

References:

• Can't sign in or activate Outlook and Microsoft 365 applications
• Some reasons you can't access your Office apps | Microsoft Support
• Password prompt at every Outlook start or can't create profile
• Office Stopped Working / says I am not connected to the internet - Microsoft Q&A Suddenly my office products are saying they need to be activated and when I try that, I get an error message saying I am not connected to the internet. I am connected (and have tried multiple WiFis). I am actively logged into my Windows account (online) and see my Drive and see my valid Office 365 subscription.
• Logging in to Excel and Word - Microsoft Q&A I cannot log in to Excel or Word. I get the error message "It doesn't look like you are connected to the internet. Check your connection and try again. 0x800704cf".
• I can't connect to my Exchange account in Outlook for Mac | Microsoft Support