So I'm assuming this was because of storage on SD card, but is there any other thing that could've prevented me from take panoramas?

Hi, there. Thank you for reaching out and we do apologize for the inconvenience. You need to make sure that you are currently using the updated firmware for you to avoid any problem when shooting a panorama. Also, we required to have the DJI Go 4 Application version 4.1.14 or higher. Should you have any inquiries or concerns please don't hesitate to reach us. Thank you for your continued support. Cheers!