When I worked for Openreach as a CST doing both Copper and Fibre I had it confirmed there is no Waiting List for an FTTC Port.
What you need to do is periodically keep checking the Wholesale Availability Checker.
As stated there should be any reason why you can’t order , the ‘cabinet’ isn’t showing waiting list for WBC SoGEA , which is what you would be ordering , it’s showing ‘ available ‘ , on a more general note , you don’t join a list if a cabinet is at capacity, it’s first come first served, so if a waiting list cabinet changes to available, because someone stopped using a port in the cabinet, the first ISP to make an order gets the port , not whoever was waiting the longest ….but it doesn’t apply here anyway.
@Maxsimpson wrote:
There is no service provided via the master socket
That's what you would expect until you select your ISP and place an order