SendGrid Authentication Error

I’m on SendGrid’s free tier. It has been working fine till few hours ago but stopped working now. It is showing authentication error. I’m not sure if I’ve exceeded their 100 emails/day quota or something else is wrong? How do I find out the issue?

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From your account on Sendgrid you can see how many emails you have sent in the day. I don’t think authentication error has anything to do with the quota.