Thank you for info.
TLS 1.2 was first released in firmware version 073.xxx.197.28500. However, there have been several releases since then.
As Gabiene stated earlier in this topic, update to the latest firmware here:
Does your 7855 look like this with your firmware? STARTTLS passing the O365 TLS1.2 smtp.office365.com validation?
The printer is still not sending TLS 1.2.
Anyone having success?