Hello! It looks like the email address you provided does not match a SendGrid-verified Sender Identity. You can find additional information about verifying Sender Identities directly on the SendGrid site. The following forum post is also a great resource for setting up SendGrid: Beginner’s Guide to Sending Emails with Sendgrid
You might also check out the Setting up SendGrid section of the Bubble manual.
If you’ve followed all steps and are still receiving this error, please do feel free to reach out to Bubble Support!