@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