Hello Lunar5202, I hope you are doing well.
Could you please answer these questions first:
Which O.S are you using on your mobile(android,IOS?)
Have you downloaded the mobile app?
The browser extension is not enabled on the mobile app. You need to install the app and use the QR code provided by the browser extension to transfer your GPG keys. You can follow this procedure described in this documentation.
I hope this helps. Please feel free to contact me if you have any problems.