If you use Gmail as SMTP provider, you will have to enable "Less secure apps access” to be able to send emails.
Have you set up your own credentials to use with SMTP server of your choice?
Need more information as it sounds like you are copying credentials from what’s in the video, rather than using your own?
Can you try a configuration setup using your company mail id ( Office 365) and try ?
You can check the Server name and Port under SMTP section :
And can you also share the Screen shot of the Configuration by masking your password.
Here it is @Dinesh V