@S23Ultrauser1: Please check the in-app security settings, and make sure that the phone number is correctly registered. If you're based in the UK, you may wish to try replacing the first '0' with '+44' to see if this helps. If the problem persists it is also worth exploring any alternative verification methods that are on offer in the absence of SMS verification.
@S23Ultrauser1: If an app has 2-step verification, then the registered phone number will be present inside the app settings themselves, and not in the phone settings (aside from your Google and Samsung accounts). With this in mind, please open the relevant app and check the security or account settings, or reach out to the app developer directly for further guidance.
