I'm not sure if this is the correct place for my question:

I have been using a printer adapter TP-WPS510u successfully for several years. Recently because of upheavals at home I reset it. It now has the default SSDI  WLAN-PS which is different to my network SSID. Therefore it cannot be seen by my router Fritz Box 7490 although I have entered the same IP address and the MAC address in the router. How can I include it in my network? I seem to remember that I had this problem at the begining but can't find the solution.

2.1.19

Tried changing the Network SSID in my router to WLAN-PS but that didn't help either.