A. 1. Verify that the recipient's details are entered correctly, including their account number and any required identifiers. 2. Ensure that both you and the recipient are using the latest version of the app, as compatibility issues can arise with outdated versions.

B. 1. Check if there are any limits on the amount you can transfer, as exceeding these limits can cause issues. 2. If the transfer fails, try waiting a few minutes and then attempt the transfer again, as it may be a temporary issue.