Urgent - Create Folder Returning null

If there are multiple changes at the same time in the same account or shared folder (or more accurately, "namespace"), you can run in to this 'too_many_write_operations' error, which is "lock contention". That's not explicit rate limiting, but rather a result of how Dropbox works on the back-end. This is a technical inability to make a modification in the account or shared folder at the time of the API call. This error indicates that there was simultaneous activity in the account or shared/team folder preventing your app from making the state-modifying call (e.g., adding, editing, moving, copying, sharing, or deleting files/folders) it is attempting. The simultaneous activity could be coming from your app itself, or elsewhere, e.g., from the user's desktop client. It can come from the same user, or another member of a shared folder. You can find more information about lock contention here.

The app should be written to automatically handle this error when it occurs, but to help avoid this error to begin with, you should avoid making multiple concurrent state modifications in the same namespace and use batch endpoints where possible, such as CreateFolderBatchAsync. That won't guarantee that you won't run in to this error though, as contention can still come from other sources, so you should also implement error handling and automatic retrying as needed.