Sometimes, when I try to activate Soulpeacemaker, I am unable to even if I haven't used the effect that turn. I started noticing this problem yesterday. The option to use the card doesn't pop up. Yes, I made sure that I hadn't used the effect more than once a turn before posting.

The only correlation I have noticed is that this always happens when I summon Soulpeacemaker from the graveyard. When I equip it from the hand, this only happens occasionally.
Can you provide a replay, there is ton of possible reason that you could not use the effect
Exemple: you used Light of Sekka this duel