I have tried to export this character and continue to get the 403 error

here is what I know so far

1. Other characters export fine

2. Other browsers have the same issue

3. I have removed any homebrew content

4. I have logged out and back in

5. i have checked to make sure everything necessary has been chosen for the character

https://ddb.ac/characters/6171253/g8Bs5C

Hmmm I'm not seeing any custom skills, nor do I remember creating one, what one are you seeing?

yup, that was it, the person using this character must have added that somehow, I never even saw it

Thanks so much

hopefully this helps someone else

In conclusion: I could not find this on the Edit Character pages, I had to view the character sheet itself, scroll to the bottom and remove the "custom skill 1"