@David-TP 

Thanks, but looks like you didn't read my original post. 

I don' have an issue with connecting devices to the range extender. 

I did solve this when I was using the extender as proxy. 

I am now using it in Onemesh mode after a full reset of the extender. 

I have only one issue - connecting the range extender to the router in Onemesh mode when access control on the router is enabled. 

Once I disable access control on the router I am able to connect in Onemesh fine. 

Then I can re-enable access control on the router and everything connects fine to the extender. 

Since I have the router set to restart every day I need to repeat this process every day. 

I have the extender's both physical and virtual Macs added to the whitelist of the router so I shouldn't need to disable access control on the router. 

Hope it is clearer now what the problem is. 

  @David-TP 

Thanks.

Yes, this is happening every time the router is restarted and also I was not able to even connect the extender to the router for initial setup in Onemesh without disabling the access control.