Smart Hub 2's settings preventing Echo Show 5 connecting?

[JB10]

I received an Echo Show 5 for Christmas but it will not connect to my Smart Hub 2 - message says to check wi-fi settings. Having read some troubleshooting guidance I have turned off Smart Setup and also switched off 5 GHz wireless. I have also opened the TCP ports 55442, 55443 and UDP port 55444. Still no success. I have three Echo Dots that are connected without problem and other devices on the wi-fi are working normally, it is just the Echo Show that is problematical. Any suggestions appreciated. 

[TheSeasider]

Back to the Basics here ....

1. You HAVE connected it to your Amazon Account haven't you ???  
2. Is it showing up in your SH2 "Listings"
3.  This may of assistance to you >>>>>> https://uk.pcmag.com/amazon-echo/90941/how-to-set-up-multiple-echo-devices-and-enable-multi-room-mus...

[al_may]

I turned off Extended UPnP security and it worked

[Les-Gibson]

Deleted: I've just seen the date of the original post