If you have added account on the linking page (you wrote there is the only one) you have done everything required... Next, try to compare format of bank account inside of reconciliation file and value entered on the linking page... I had situation (here in Serbia) that bank account (string value) can different if you compare it on the paper document and in reconcilation file.
for example
my bank account printed on the statement
123-123455-12
but in the reconciliation file it is
RS123000012345512