Thanks for your interest in Portfolio manager.
Yes it's a shame Behance has stopped the API access for the new Apps.
I have sent you a spare key in your email.
This is the key we created before for test purposes, so there shouldn't be any issue using it.
We are on the lookout for the solution.
However, neither Adobe, nor the Behance team have provided any solution for the workaround of the keys so far.