Cannot finish the quest to activate it, it won’t allow you to interact with it at all.
Edit: If you keep loading the spawn point eventually it’ll let you activate it, try that until Bungie resolves the issue.
A few workarounds:
• Try fast-traveling to the same zone
• Walk away from the Obelisk, return to it and try again
• Head to an alternate area (fast travel to another LZ, or sparrow to the lost sector) and return
These don't fix 100% of the time, but multiple attempts will yield success. I had to reload ~5 times to have the prompt return for interaction.
The team is investigating the issue. Once we have a fix planned, we'll let you know.