The Note9 is compatible with MicroSD cards (Up to 512GB). The brand would be irrelevant.
If you are encountering a problem with your SD cards, you can first restart your phone. Next, remove and replace the SD card to see if this resolves the issue.
If the problem persists, remove the SD card and insert it into a different compatible device to determine if the error is coming from the card itself or the phone.
Thanks for all the response. I did check to make sure I put sd card correctly in. Also I found a microsd card reader and noticed it wasnt reading the micro sd card when i connected it to my macbook. So I decide to buy a new micro sd card because the sd card is not being read by sd card reader.