This issue might be related to your Mac or Windows device's Date & Time settings. Sadly AWS rejects requests when this setting is not set to auto, due to security measures.
Please check your device's Date & Time settings, make sure that they're set to auto, and try again. If this doesn't solve the issue, you can try exporting on another network to see if that helps, following our Fixing connectivity issues guide.
If you’re still experiencing the issue after trying out these steps, you can contact us at firstname.lastname@example.org.