Mikrotik RB952Ui-5ac2nD 802.11ac bridging

Hi

Trying to use the Mikrotik RB952Ui-5ac2nD router as a 5GHz bridge.

I have a computer and a couple of laptops using 5GHz WiFi ok.

The router bridging works ok on 2.4GHz.

Basic config is CPE, static IP, mask and a gateway to my AP Router.

Available APs show in the Mikrotik router for 2.4GHz only.

If I scan the 5GHz WLan (in the Mikrotik router) I see my Lynksys EA6700 but but the 5GHz AP doesn't appear in the available APs list.

Anyone else been able to get 5GHz bridging working?

Thanks

Cheers