What can I do if the Meet S or other devices cannot connect to the Internet via Ethernet nor Wifi?

If the device cannot connect to the Internet, you can try to change the time and time zone on the Meet S. Here are the stops:

Step 1  Click the version number for 5 times and then hold it for the 6th click to enter the system page.

Step 2  Find the Date and Time.

Step 3  Disable the automatic date and time and automatic time zone. Then set the date, time and time zone manually. 

Step 4 Then go back to the system page. Right click on the system page and you can go back to the Onion's page.

Here is the video tutorial for your reference.