Both the Apple VPP token and the Apple enrollment token need to be updated once a year.
https://business.apple.com/#main/settings/appsandbooks
User Profile (Bottom Left) -> Preferences -> Intune -> Server Tokens
https://business.apple.com/#main/accounts
User Profile (bottom left) - Preferences -> Payments and Billing -> Content Token, Download
https://endpoint.microsoft.com/#blade/Microsoft_Intune_Enrollment/DepTokensPagingBlade
Endpoint manager -> Tenant Administration -> Connectors and Tokens -> Apple VPP -> Edit basic settings -> Upload new file
Endpoint manager -> Devices -> iPad/iOs -> Enrollment -> Enrollment program tokens
Select token
Properties -> Basics -> Edit -> Upload new token
Apple MDM Push Certificate
https://endpoint.microsoft.com/#view/Microsoft_Intune_DeviceSettings/DevicesIosMenu/~/iosEnrollment
Intune -> Devices -> iOS -> iOS Enrollment -> Apple MDM Push Certificate
Download your CSR
https://identity.apple.com/pushcert/
Sign in with AppleDEP Account
Renew cert -> Upload CSR -> Download Cert
Upload new cert back in the Intune portal