Symptoms
When trying to migrate, or running a pre-check on a file from Microsoft 365, you receive the following error message:
The folder name 'FOLDER_NAME' contains one or more special characters (e.g. '#' or '%') that prevent Sharegate from fetching its files. Renaming the folder to remove these characters will allow Sharegate to copy its content.
Error code
AN-116-018
Details
This issue stems from the Microsoft API and there is no workaround at this time. This only applies specifically to files migrated from a Microsoft 365 source.
Solution
You will need to rename the folder to remove the problematic special characters, and run the migration or pre-check again.