Originally Posted by
f0zzyNUE
there might be no J availability on the married segment. you should be able to upgrade the longhaul segment only when there is J availability.
Have you tried this link?
https://www.turkishairlines.com/de-a...iness-upgrade/
Click on the "Elite Plus business upgrade" button
there is j available both on separate legs and as one combined ticket. The agent also said that upgrade is available but it’s probably a technical error.
I can also upgrade both legs with miles per the link you gave: