Hi @florian.buehringer ,
Welcome to the Auth0 Community!
I searched the error “unable to resolve jtn to webtask token” on our community and found a couple of topics provided solution for this error.
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Failure creating a token for auth0-authorization-extension-api - #2
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Authorization Extension: unable to resolve jtn to webtask token - #3 by James.Morrison
Does any of them help?