I am traveling from HYD-DOH-DFW in July. I have HYD-DOH in economy and DOH-DFW in business - how can I request upgrade first leg, HYD-DOH using avios or $? is this allowed?

Booked the full ticket using Avios on Qatar website
HYD-DOH is on Indigo
DOH-DFW is on Qatar

I just chatted with Qatar through live chat and he told me award tickets are not eligible for cabin upgrade.