T7-01 not there?

This appears to be working for people who obtained a "temporary" companion after Patch 4.0 (open the Companions and Contacts window to summon them), but is broken for people who had a temp companion before the patch; see this Reddit post.

(For clarity, in pre-4.0 content most companions temporarily accompany you during critical quests before becoming "permanent" companions; it's this temporary state that was not properly migrated into the new system.)

At this point, all you can do is wait for it to be fixed — or, since you are on the starter planet, you might opt to delete the character and start over.