Push Notification Service certificate expiration

My boss received this email this morning:

The following Apple Push Notification Service certificate, created for AppleID xxxxxxxxx will expire on November 13, 2021. Revoking or allowing this certificate to expire will require existing devices to be re-enrolled with a new push certificate.

Mobile Device Management - null

Please contact your vendor to generate a new request (a signed CSR), then visit https://identity.apple.com/pushcert to renew your Apple Push Notification Service certificate.

Thank You,

Apple Push Notification Service

We are not aware of MDM program across our organization, and have never seen anything like this before. Is this a Phishing Expedition ?