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Set up for optimum server settitngs

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I can not get the Optimum setting to work. I am currently using TB for Verizon and I have no problem with it but no matter what I do I can not get the TB to connect with the Optimum "mail.optimum.net"

I am using the instructions from Optimum https://www.optimum.net/FAQ/#/answers/a_id/3897 I am setting it up for IMAP, When I hit the "Re Test", it say server found with settings. However when I hit the "Done" button, it comes back with "Unable to log into server. Probably wrong configuration, user name or password. If I try the POP3 setting If I hit Advance it does not go there but looks like it created a new account but if I attemp to l check messages I get the error message "Sending of password for user elyankowski did not succeed. Mail server mail.optimum.net responded: Authentication failed"

I can sign on to the Optimum Web mail but rather use TB. Any ideas what is wrong.

I can not get the Optimum setting to work. I am currently using TB for Verizon and I have no problem with it but no matter what I do I can not get the TB to connect with the Optimum "mail.optimum.net" I am using the instructions from Optimum https://www.optimum.net/FAQ/#/answers/a_id/3897 I am setting it up for IMAP, When I hit the "Re Test", it say server found with settings. However when I hit the "Done" button, it comes back with "Unable to log into server. Probably wrong configuration, user name or password. If I try the POP3 setting If I hit Advance it does not go there but looks like it created a new account but if I attemp to l check messages I get the error message "Sending of password for user elyankowski did not succeed. Mail server mail.optimum.net responded: Authentication failed" I can sign on to the Optimum Web mail but rather use TB. Any ideas what is wrong.

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Do you have the full email address for the User Name? Based on your link, the settings should be: incoming IMAP/POP server mail.optimum.net, port = 993/995, security = SSL/TLS, authentication = normal password, User Name = email address; outgoing SMTP server mail.optimum.net on port 587, STARTTLS security, authentication = normal password, User Name = email address.