Answer: Prohibited in Kabbalah means impossible.
It cannot be pronounced because it has no realization in the language but can only be realized inside the spiritual desire. There are many other names of the Creator: Elokim, Adni, Shadai, etc.
The name of the Creator does not mean that it is His name at all. This is what I call Him from my qualities, because in me, inside, the soul consists of four parts: Yod-Hey-Vav-Hey. When I receive light in them, it creates a combination of my desires and light. This is what I call the feeling of the Creator or His name.
I call it according to my feelings. Therefore, there is nothing special or exalted in this name to be afraid of. On the contrary, you need to attain it, get into it, so that it becomes completely yours, as it is said: “May my name be upon you.”
From KabTV’s “The Power of The Book of Zohar” #10