Stuart Johnson wrote:

When you renew your Railcard do you then have to have the discount set
up on your Oyster card again?

Yup. As TfL have no way of knowing whether you've renewed your Railcard
or not.

I'm not sure, but I *think* NR stations that sell Oyster (such as London
Marylebone) *MAY* be able to register the discount as well, as I believe
the option to do so is there on FasTIS+.

Cheers,

Barry