I have just recently started using these spells. I don't think it matters whom you click on while casting Create Portal. The only time these spells fail on me is when I'm in a dungeon. My guess is you have to be outside to use these spells. I don't know if Sorcery skill has an effect on how often the teleport spells fail (flashback to headaches from Asheron's Call portal spells) but my Sorcery skill is around 6-7. Hope that helps.
JMB
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