@Tahira-SP 

Hi,

How did you install the TL-WPA4220? Do you remember pressing the WPS button of your router in the process? In case you did, then the SSID of the TL-WPA4220 might now be identical to the one of your Wi-Fi router and not the one printed on the label of the TL-WPA4220.

  @woozle thank you so much for this.

Yes I did press it. I should be able to reset it all and do it without pressing the WPS button. I hope it works.

  @Tahira-SP 

Yes, if you reset the TL-WPA4220, then its SSID (and Wireless Password) will revert to what is printed on the label.