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anonymous user and @Carlos Galan
Thank you both for your time and patience throughout this issue. Looking at the documentation, this issue doesn't look to be related to Azure RBAC, and SendGrid currently isn't supported on MS Q&A.
I'd recommend retrying the deployment after a few moments as stated in the error message or posting on our SendGrid SO forum since our experts on SendGrid can be found there. If you're still running into issues, please reach out to the SendGrid Developer Community.
Thank you both for your time and patience throughout this issue.