What you may need too look at is the level at which your character's Sorcery skill is. This will affect the chance of a spell failure. I was able to create a portal right outside Cet's Tomb and it worked every time with a Sorcery skill level of 7.
I started playing around with it and I discovered I could teleport monsters to the portal. I even made a portal on top of Cet's tomb and it worked. So I think it may be the sorcery level.
Mark
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