mDNS for UNO R4 Wifi

Hi
I am not to good at this. But have tried for a while.

Is there a way to make mDNS to work so that I can find a IP adress to use to send data to a server that changes adress or location.

I have used WiFiS3.h which "ESPmDNS.h" <ArduinoMDNS.h>
But it does not work.

/T

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