We have implemented a fix which should resolve this issue temporarily – however this fix may not be stable. Please try usual methods for editing/creating ads and if they fail please use the workaround.
Creating and editing external ads is not possible through SAT interface.
An issue with the Facebook API prevents this operation.
Use Import/Export (editing in Excel) feature to make edits and creations of external ads.
We expect a fix to be available by end of the day.
Other issues caused by this problem:
Creation of channels may fail with or without error.
Updating (editing) of channels may fail with or without error.
There are no workarounds for those issues at this point.