Are you using a VPN?
I started getting this error yesterday and found that if I logout of the VPN and refreshed the account in Jdownloader's account screen then it authenticates it without any need for a catchpa.
I can then log back in to the VPN, and download files until JD re-checks the login details.
What is odd is that it worked quite happily whilst using the VPN for several hours today, before suddenly throwing the 406 error.
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