3386804 - CPI interfaces are failing in Production with "Unexpected status code 429 while retrieving access token" "Rate limit exceeded" error

You are facing error below while sending messages using CPI:

com.google.common.util.concurrent.UncheckedExecutionException: com.sap.it.cm.x509.exception.CertificateManagementBackendException: [CertificateManagement][X509][BackendError]:Error code 429 "Unexpected status code 429 while retrieving access token: POST https://credstoreauth.cfapps.<DC>.hana.ondemand.com/api/v1/token HTTP/1.1 {"trackingId":"us21-<ID>","errorCode":"rate_limit_exceeded","errorDescription":"Rate limit exceeded","error_code":"rate_limit_exceeded"}" reported by backend., cause: com.sap.cp.security.credstore.client.CredentialStoreErrorResponseException: Unexpected status code 429 while retrieving access token: POST https://credstoreauth.cfapps.<DC>.hana.ondemand.com/api/v1/token HTTP/1.1 {"trackingId":"us21-<ID>","errorCode":"rate_limit_exceeded","errorDescription":"Rate limit exceeded","error_code":"rate_limit_exceeded"}

• SAP Integration Suite
• SAP Business Technology Platform
• Cloud Integration

SAP HANA Cloud Integration, SAP HCI, SAP CPI, SCPI, SFSF, IS, Suite, tenant, iFlow, Integration Flow, deployment, model configurator, properties, interfaces, failing, while, sending, messages, com.google.common.util.concurrent.UncheckedExecutionException: com.sap.it.cm.x509.exception.CertificateManagementBackendException: [CertificateManagement][X509][BackendError]:Error code 429 "Unexpected status code 429 while retrieving access token: POST https://credstoreauth.cfapps.<DC>.hana.ondemand.com/api/v1/token HTTP/1.1 {"trackingId":"us21-<ID>","errorCode":"rate_limit_exceeded","errorDescription":"Rate limit exceeded","error_code":"rate_limit_exceeded"}" reported by backend., cause: com.sap.cp.security.credstore.client.CredentialStoreErrorResponseException: Unexpected status code 429 while retrieving access token: POST https://credstoreauth.cfapps.<DC>.hana.ondemand.com/api/v1/token HTTP/1.1 {"trackingId":"us21-<ID>","errorCode":"rate_limit_exceeded","errorDescription":"Rate limit exceeded","error_code":"rate_limit_exceeded"} , KBA , LOD-HCI-PI-CON-RFC , RFC Adapter , Problem