Firestick says connected to WiFi signal strength very good Channel 6 quality good not connected to the internet. I rebooted my modem and my router and contacted the internet provider said all was working well. Except for firestick. Any suggestions?

My firestick says it is connected to wi-fi, signal strength very good, channel 6 quality good, not connected th of the internet. I restarted router and modem,I contacted internet provider,all working but I can not get firestick to work. Any suggestions?