I heard people are having issues to enable/disable account recently. See the post here: Enable/DIsable Account API issue
@pr226b , @Abhinov7 could you please confirm if you were able to solve this issue?
Apart from this , I would suggest to aggregate the use , remove any rule attached to the source and then again retry. If you see success then it might be a rule issue.
If it is not related to rule then open a support ticket for it.