DKIM, DMARC, SPF, etc., all pass, so the email seems legitimate. I'm not sure why their staging environment is sending out real emails to customers.
Title: [STAGING Cloudflare] Billing Account Email Changed
From: noreply@notify.cloudflare.com
Hello,
You will no longer receive Cloudflare billing
notifications to this email address because your
Cloudflare account billing email has been updated.
Log in to view and modify your billing email address on
file. Please allow up to 15 minutes for the billing email
to update on the dashboard.
For additional assistance, refer to our Support portal.
Thanks,
The Cloudflare Team
On 02/14 you may have received up to 2 emails from Cloudflare's test environment that were sent in error. You can disregard it. CF already implemented measures to avoid these types of errors in the future.
You can open a support ticket if you have any questions.
Anyways, looks like that one Starbucks incident where someone (probably an intern again) sent out
Test1 from seank
to all (most?) mobile app users.