@blackhart All versions of SCFA have a difficult time with using network storage systems like OneDrive, Dropbox, etc..

To get around this for FAF, you'll need to:

go to FAF client > top left menu > Settings > Forged Alliance Forever > Maps and Mods Location > Choose... navigate to a location outside of OneDrive either select an already existing folder or create a new folder for where FAF will store your maps/mods & then select the new folder double-check the new path to ensure that it's not in OneDrive