I've never experienced such a headache as I have with sendgrid once I signed up with the 2FA. I was able to sign in once, after that, I never received another code from the author app that I had to download to be able to sign in. I signed up with another email account, and set the 2FA to text me a code, I again received one text and have not been able to sign in again. You can't call in, they only offer that to the top tier customers. I have to try and rely on emails, fill out the form, wait. Get and email, wait, respond, wait. I'd go with another company.