Firewall not being discovered in Central Firewall Manager

I have a XG105 firewall that does not appear in Sophos Central Firewall Manager and the Discover at top of page does not show the firewall.

I have the settings configured on the xg firewall / Administration-Central Management as instructed by Sophos documentation.

I have shared the firewall My Account-Network Protection-View Devices and also accepted the Management of firewall

I also have the latest firmware: SFOS 16.05.6

I have changed the xg device settings from Central will push to Firewall will fetch but that does not work either.

Does anyone have a suggestion?Thanks