1) i got my mbb 2 card. applied for online banking since i don't have savings account with MBB. When i login, can only see MC, cannot see Amex... cause i applied using MC.
2) i opened a savings account after that, due to payroll reasons... then i told the bank officer about problem 1). bank officer was very helpful, and helped me link everything for me... then login again... still cannot see my Amex card...
3) frustrated... i went to maybank AGAIN... told the bank officer my problem... she said, "from system, it's shown that your savings account, MC and AMEX are linked.
so she was helpful she suggested... i cancel my login id linked to the MC... created a brand new id linked to the debit card/savings account... PROBLEM SOLVED
Prior to my step 1, i saw the post in LYN on the problem as well, but clearly it didn't work for me...
Anyway, good luck for now.

Edit: in case you were wondering, this happened about less than 4 months ago
Same thing here...got to open saving account and create new login id.....after that every thing linked