Hey Hampus,
Thanks for sharing your issue with us,
From the error message, it sounds like it's an issue related to Power-BI-Integration-Utility.
You will find the following under "Troubleshooting Tips" section:
If you get the error: "Expression.Error: The 'Authorization' header is only supported when connecting anonymously. These headers can be used with all authentication types: Accept, Accept-Charset, Accept-Language, Cache-Control, If-Modified-Since, Referer" this means the OData authentication type is not set to Anonymous. To modify the setting, navigate to File > Options and settings > Data source settings. Find your data source URL from the list, click Edit, edit the credential type to be Anonymous, and click Done. Try again.
Please let us know if there's anything further we can assist with.
Thanks.
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