Barish Grubu who represented Iran at Turkvizyon 2014 have reportedly been banned from performing by the Iranian authorities.
Barish Grubu who performed in Kazan under the Iranian flag are actually a band from South Azerbaijan a region in Iran that is pushing for great autonomy. The band broke Iranian law by promoting pan-Turkism as a result of participating in the contest.
It seems unlikely that any future participation of Iran in Turkvizyon will be permitted by Iranian authorities.
Source: Iran Briefing