Got this response from SWTOR Support today:
Greetings,
Since Game Update 4.3 went live, we discovered a bug that has prevented some of you from getting proper Legendary Player credit for Class storylines that you completed.
We investigated and found some missing triggers in the background. These can block some completed Class storylines from properly counting towards your Legendary Player status.
Because this bug is caused by a background trigger, Customer Service cannot restore Legendary Player status if you’ve been affected by this bug.
We did hope to have an automatic fix for you with Game Update 4.4 in May, but unfortunately this fix did not catch everyone who was affected. We’re aiming for a full fix with Game Update 4.5 on June 1st.
We are sorry about the continued wait, and we appreciate your patience.
Galactic Support is our specialty….
The Star Wars™: The Old Republic™ customer support team
Galactic Support is our specialty….
The Star Wars™: The Old Republic™ Customer Service Team
Funny thing is I never had an issue with my Legendary Status and no where in my original e-mail did I say anything about Legendary Status. I sent them a reply stating that I never had an issue with my Legendary Status and then reiterated my original e-mail telling them again about the issue with not being able to enter the Odessen Alliance Base and not having a mission for Chapter 13 in my Mission Log. I also told them about this thread and this time I remembered to add a link to this thread as well.