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Hi @Steveo1123
Welcome to the Community!
After Enabling the WPS function, did you Enable the WPS of your Wireless extender? If the WPS lits up, then it means it is functioning and waiting for a device to connect to it.
If you can't connect the D-Link via WPS, then you may choose the other option. Try to contact the support of D-Link to guide you on how to connect it using the wireless extender interface.
How do I set up and install my Wireless Extender? - from D-Link website.
BasilDV