@D. J. Das. Bro, Look like customer id not generated for ur account, contact lco or contact bsnl team, for me from connection installed day itself able to login in self care portal
If ur issue not resolved means send email to below mentioned email
I usr Netlink HG323DAC device for my BSNL fiber connection in Tamilnadu.
I am still using the old Superstar Rs.779 plan that gives 100 Mbps till 1000 GB and 5 Mbps after 1000 GB + hotstar premium only. Yes. Premium till now. Thats why I am still in that plan.
The local cable operator incharge for BSNL fiber is quite friendly. I have faced maximum 20 to 30 non continuous days of disruption since October 2020 when got the fiber connection.