Hi @Darren Gulliver Thank you for posting your question on Microsoft Q&A and for using Azure services.
I am sorry to hear that you are having issues when deploying an Azure SQL database elastic pool.
*I did find this question non-breaking error AADSTS50196 at end of SQLPackage.exe deployment to Azure SQL Database using Azure Active Directory Password authentication but I'm not sure if this is exactly the same scenario mainly because I'm not seeing Auth0 errors like the poster in the question. Same as the poster the deploy does run successfully but it does take around 10 minutes per environment. *
The "client loop" error is the same. This is the fix in this GitHub issue provided by our Product group? https://github.com/microsoft/DacFx/issues/92
Please let us know if that works
Regards,
Oury