Office 365 says Not Connected to Internet

Open Start, type: CMD
Right click CMD
Click Run as administrator

At the command prompt, type:

netsh int ip reset

Hit Enter
Exit the prompt then restart

Open Start > Settings > Update & security > Troubleshoot
Scroll down
Click Network adapters
Click Run the Troubleshooter

When complete, restart to see if the problem is resolved.

If that does not work

Press Windows key + X
Click Device Manager
Expand Network Adapters
Select the Network card listed,
Select “Update Driver”
This should give you a choice of drivers - select the oldest one
Wait a few minutes while it installs the old driver

or

press Windows key + X
Click Device Manager
Expand Network adapters
Right click your adapter
Click Uninstall


Exit Device Manager, restart. Windows 10 should detect the network adapter then reinstall it. Check if you can connect and browse.

also try:

Open Start > Settings > Network & Internet > Status


Scroll to the bottom then click Network reset.

Click Start > Settings > Network & Internet > Wi-Fi > Manage known networks > select the wireless network
Click Forget

Restart

Click the Network icon in the Taskbar
Try connecting again.

If that does not work...

Open Start > Settings > Apps > Apps & features
Scroll down to Microsoft Office
Select it
Click Change

Now, wait while the repair wizard starts up.

Choose the type of repair you would like to perform. Depending on the severity or availability of your Internet connection, you could try the first option, Quick Repair, which is much faster and tries to fix the problem without a data connection.

If that doesn’t resolve the problem, then go back and try the Online Repair option. For my particular issue, I ultimately had to use the Online Repair.

The repair process is straight-forward following the wizard. Note that you’ll need to save your work and close all Office programs first, and then click Repair.

Then wait while the repair process runs.

You will notice the repair experience is similar to a fresh installation. The amount of time it takes will depend on your connection speed and what the issue is.

You will see your Office apps light up in their respective colors while the repair completes.

Once the installation is complete, restart your computer just to be sure and launch your apps and verify if the problem you were having is resolved.