The rogue level 5 perk Ambidexterous does not grant the feat Ambidexterity. I tried relogging but haven't tried after a server reset. I don't have the dexterity required to use the feat normally however, which may affect me having access to it.
Have you tried resting and going through the crafting menu to re-apply the perk?
Have you tried to move to another area, are you multiclassed?
I have tried resetting the perk yes, but I didn't rest. I'll give that a go. I have tried going to another area, and no, I am not multiclassed.
Update- I tried resting then resetting the perk, it did not work.
It works... but shows late after you've picked your level 8 perk. I'll modify!