This was a solution another individual found:
"In the WiFi screen, I selected the menu icon.
Selected Advanced settings
Clicked on WPS push button
I pushed the WPS button on the front of my router and it instantly connected."
If that does not solve the issue, Try going to a public place and connecting to different public wifi. let us know the results.
If you have no issues, it could be the band being used on your router is not supported by the tablet.
If you have issues ( try at least 4/5) it could be a software issue or an issue with the wifi chip. If this is the case, ensure you have the most up to date version, try reflashing it.