Good day @mjhint
It's really good to know that you have successfully added your new up-to-date mobile number and I am very sorry that you are still not being given an option to use it as far as security code is concerned.
Please follow the steps below if you haven't done it yet.
1. Set you new number as your primary.
2. Delete all the out-dated phone number on the account.
3. Wait for the next 24 hours to reset the system so it will only detect your newly added phone number (but sometimes, logging out and logging back in works, as well as clearing cache and cookies).
Try switching your platform from PayPal app to mobile web browser / from mobile to desktop or computer / and vise-versa.
I hope it works!
***If you saw a post that is helpful, kindly give the author Kudos or accept it as a solution. Thank you and keep safe!
