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Close all other applications running in the background that may be using Outlook or Excel.
Check if Outlook is set as the default email client in the system settings. If not, set it as the default email client.
Try using the latest version of Microsoft Office and ensure that all updates are installed.
Ensure that the VBA code is written correctly and there are no syntax errors or logical errors.
Try disabling add-ins in Outlook and Excel to see if they are causing the issue.
Try running the VBA code in Safe Mode.
Try repairing or reinstalling Microsoft Office.
Verify that the email address entered in the VBA code is valid and the receiver is accepting emails from unknown sources.
Check that there are no security measures in place that restrict sending emails through Outlook, such as firewalls or antivirus software.
Try using a different email provider or email client to send the email.