@Yigiter010 Both devices need the "mesh" program. Either both are onemesh or both are easymesh to make it work correctly.

  @DVair both devices are listed as OneMesh compatible. But the extender says the router doesn't support OneMesh and the OneMesh feature is not there in the settings. 

  @Yigiter010 

It may depend on which version, language, or area if it is supported?

A quick look at the router US english version 1 emulator does not show mesh where the lateset version does.