National Payments Corporation of India [NPCI] — ecs payment from nre account rejected by lic via nach form

Address:

560019

My lic policy premia have been paid through ecs from my nre account for several years. After the nach form became mandatory, mysteriously, the premia are not being being transferred from the same account, despite having filled the form correctly; as a result, i am missing the last dates for premium payment, i have to do it manually, and it has become a huge headache.
Nobody seems to know why it is being rejected. Both lic and the concerned bank are saying there is no problem from their end.
Please advice urgently/ allow the ecs/ nach mandate to work for nre account.
India zindabad!!