I have been facing the same issue as well, wondering if Marketo support has been able to resolve it for you yet?
Unfortunately not yet - the latest I have heard from support was a couple of days ago, when they emailed to advise that they had developed a patch but it does not seem to have resolved the issue yet. They are following up to review the patch and will be in touch".
I will post here as soon as I have resolution - hopefully not too far away now! 🙂
Good news - this has now been resolved. Marketo engineers have created a patch which has fixed this error. I am now able to see custom audiences in Facebook from AdBridge! 🙂 I'm not sure exactly what the problem was or how it was rectified, but a solution now exists!
Yes, it seems that the Marketo Support Team has patched the issue for my account! Hopefully yours is resolved as well Diana! 🙂