Model :AC750 dual band extender

Purchased today and set it up but when I try to connect to it on my phone, it simply loads on obtaining ip address. No other devices have managed to connect although my laptop did connect to the 5hz connection but that doesn't show up on other devices.

I bought this to replace my bt extender which was not working but this seems to be facing problems too...

I've connected multiple times using the app and the website. Using wps doesn't seem to work. 

Any advice would be appreciated.

Edit: i used the troubleshooter on my computer and that resolved the IP issue; changed my phone wifi settings to make it static and it says 'connected,  no internet'