Tarkowski, Michael (M.) Thanks for posting your question in Microsoft Q&A. Based on the detailed steps in the doc, you are trying to create a function app in Azure from Visual Studio Code and faced error Credentials argument needs to implement signRequest method
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This is similar to the question posted in thread: https://stackoverflow.com/a/73375127 and appears to be VS code sign issues. Have you already tried this solution? If it didn't help, I suggest you file an issue with Azure Functions extension https://github.com/microsoft/vscode-azurefunctions/issues/ with details including Azure Function Core Tools version, VS code version, Azure Function extension version, OS etc. Our product team can investigate this issue further. I hope this helps and let me know if you have any questions.
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