Bit of a latecomer to the thread, but found myself in the same boat. I have a wires only service having been installed and has just come live. During the first set of lockdowns, the IT company who booked the leased line have ceased trading, and the owner of the site (a personal friend of mine) has asked me to take over looking after it.
So we went live today, I have the email with all the IP's in from BT IP Master, and they have given me this list.
WAN IP Address ***.***.***..191
Subnet Mask 255.255.255.254
Next hop back ***.***.***.190
LAN IP Address
Subnet Mask 255.255.255.248
1st Usable IP Address ***.***.***.194 through to ***.***.***.198
So on my Draytek, it is asking for the WAN IP Address (which in the list above would be the 1st LAN IP). BT have said they have configured the PE for all of the public addresses to be listed, so therefore that should be correct, however no connection.
Sorry to the OP for jumping in, but it looks like an extremely similar situation between us, and thought it might be further info to know there is someone in exactly the same boat,