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Hi there!
1. Have you activated your accounts? and do you see your accounts on the FS Poster section when you create a new post: https://i.imgur.com/bUx4esx.png
2. Please go to the FS Poster logs tab. If you get any errors, hover over the error button So, it will show us the reason for the error, and provide some screenshots or upload screenshots to and provide the URL to us. For instance, https://i.imgur.com/CUMbHWT.png
Best Regards,
FS Poster.