Cant Turn in Main Line Quests !

I cant turn in quests
"In for Garuda Awakening" and "Twisted Beliefs (Immortal Flames)". It shows that quest complete after attuning to aetherit* or speaking with NPC - but nothing happens and it dont work for me. Please answer is there a way to fix this because it drastically stops me from progression in game. There is really not much high lvl content in game and for me it ends on 2 dungeons and "Ifrit (Hard)" that btw turned in quite normal. Best regards.

Problem solved - it required at least one free space in the inventory even if the quest wont give a single item that requires space as a reward (except "seals"). That is strange - in this situation game wont say "u need space"* as for the quests where u get some items as a reward and really need space for them in your inventory.
Sorry for the inconvenience.