I just migrated my apps to Azure. Now my app has a sending email feature that uses Sendgrid to send email. But now I want to link this account to Azure as I think I need to link this (existing Sendgrid account) to my Azure Sendgrid Account. But how do I do this? In Azure Sendgrid it only allows me to create a Sendgrid account but there are no option to Add an existing Sendgrid account. How do I do this? Btw the reason I want to do this is because I'm getting an error of Unable to read data from the transport connection: net_io_connectionclosed. So I'm guessing this is a permission issue because I did not link my existing sendgrid to my azure sendgrid account. How do I do this?