Well, ceremonial magick like invocation comes out of JCI, namely kabbalah… the Goetia is from the Lesser Key of Solomon. So, that’s JCI, and they have a whole other pantheon and very negative views of other culture’s pantheons. Evocation and petitions would be mixing up currents. Kind of like using a mantra to communicate with Zeus…?
Not that that can’t work, but since JCI did their best to eradicate pagan religions including Norse paganism, I don’t think it sits that well to use it to talk to those gods.
I have done it, with Thor, and he wasn’t that happy with me doing it, and I think that’s why. It kind of spoiled my relationship with him.
So if you want to talk to a Norse god, I’d look to Norse techniques first.
As a god, you can connect with him via your thoughts. You can make a talisman, say, as a pendant to wear, you can invoke (not evoke, your ‘mistake’ may have been your subconscious giving you a hint there ). I would recommend the method E.A. Koetting called “preparatory immersion”, which is that you research the entity from an many authentic or original sources that you can and get to know him as well as possible before invoking.
You can also create an altar to him, have an effigy on that alter to represent him, and talk to the effigy as if it’s him. Offering are fine, petitions are again JCI and I wouldn’t. Norse was an aural culture, so, sing songs, speak to him, read him poetry.
Some info on Loki form two authors I trust