I can't learn Non-Chrono Triple Techs

[AzraeL]

I have all the members with all the magic and techniques each, but the problem is that I remember that in DS you could learn triple techniques without Crono:
- Eternal Darkness (Magus + Marle + Lucca)
- Omega Flare (Lucca + Robo + Magus)
- Spin Strike (Frog + Robo + Ayla)
- Poyozo Dance (Marle + Lucca + Ayla)
- Master Mune (Frog + Robo + Marle)

I don't know if it has anything to do with the fact that Crono has been revived, but I think something may be happening that prevents from learning those techniques.
Does anyone have an idea what could be the problem?

[Puzzlemint]

You need someone to equip the Gemstone accessories in order to use them.

[Pafti]

You don't learn those automatically like other Techs, all 5 of them require you to equip the related Gemstone Accessory(Black, Blue, Silver, White, Gold) to one of the three members.

[AzraeL]

Oh I see, I don't know how I could ignore that detail in the DS version, I must have gotten them by chance lol.
Thank you very much for your answers!