Power Platform Community Forum Thread Details

Beginning 16th May 2026 (Saturday), I've been encountering an issue with my flow that has been working for months. The "List files in folder" connector seems to return an error due to an unexpected data type in the API response (refer to attached image).

The error is as follows:

Flow run failed. Action 'List_files_in_folder' failed: The API 'onedriveforbusiness' returned an invalid response for workflow operation 'List_files_in_folder' of type 'OpenApiConnection'. Error details: 'The API operation 'ListFolderV2' requires the property 'body' to be of type 'Object' but is of type 'Array'.'

I have tried adjusting the value of the file identifier parameter:

1. Folder path, selected via the folder icon in the parameter input

2. Inputting the exact unique ID of the folder

3. Trying another folder path selected via the folder icon

All attempt above yielded the same error.

No changes were made to the flow prior to it hitting this error. The flow has been running smoothly over the past month.

Appreciate any help on this!