Setting up my SMTP plug-in inside WordPress admin and unsure of some settings.

Able to send test email to my zoho email address but submission from contact form not working with 'Authentication Failed' message returned.

Can I show what current selected settings inside Post SMTP Setup of wordpress I have made. Selected option followed by other possible (unselected) options inside brackets using red text:

Transport

Type: SMTP -  (Default, Gmail API, Mandrill API, SendGrid API, Mailgun API)

Mailer Type: PostSMTP  - (PHPMailer)

Transport Settings

Outgoing Mail Server Hostname: smtp.zoho.com

Outgoing Mail Server Port: 587

Envelope-From Email Address: user@mydomain.com

Security: STARTTLS - (None, SMTPS)

Authentication: Plain - (None, Login, CRAM-MD5, OAuth 2.0)

Authentication

Username:  user@mydomain.com

Password: my zoho email password same as I use to login to zoho mail

Notes:

user@mydomain.com is my email address that is used for my general customer service email address and the contact form on my site. It is not my super administrator email address but another one I created in my account

Also, I have added Zoho settings for TLS and not SSL. Is this correct?

many thanks,