Hello @Nicholaus Chipping , I have reproduced the same it worked well on my end. I would suggest you to check all the necessary permissions to access the Translation API.
Try verifying the roles for your resource (Azure portal->Resource->Access control) like contributor, role-based access control (RBAC) settings for the resource. Please go through this documentation: https://video2.skills-academy.com/en-us/azure/ai-services/translator/document-translation/how-to-guides/create-use-managed-identities
Make sure your subscription, and resource is valid. Generally, these are the features that are available in the F0 pricing: https://azure.microsoft.com/en-us/pricing/details/cognitive-services/translator/
At least try different authentication method and see if that helps. https://video2.skills-academy.com/en-us/azure/ai-services/translator/reference/v3-0-reference#authenticating-with-an-access-token
Please let us know if you still face issue.
Regards,
Vasavi