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AWS m2 documentation change

Service: m2 · 2026-07-01 · Documentation low

File: m2/latest/userguide/ba-runtime-error-codes-n.md

Summary

Updated service availability information: added announcement about closing new customer access to self-managed experience and ongoing security/availability improvements

Security assessment

Change references security improvements as part of ongoing maintenance but doesn't document new security features or address vulnerabilities

Diff

diff --git a/m2/latest/userguide/ba-runtime-error-codes-n.md b/m2/latest/userguide/ba-runtime-error-codes-n.md
index a81db4e7f..608b35fac 100644
--- a//m2/latest/userguide/ba-runtime-error-codes-n.md
+++ b//m2/latest/userguide/ba-runtime-error-codes-n.md
@@ -9 +9,3 @@ ADASTRIP Utility Error Codes
-AWS Mainframe Modernization Service (Managed Runtime Environment experience) is no longer open to new customers. For capabilities similar to AWS Mainframe Modernization Service (Managed Runtime Environment experience) explore AWS Mainframe Modernization Service (Self-Managed Experience). Existing customers can continue to use the service as normal. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html).
+After careful consideration, we have made the decision to close new customer access to **AWS Mainframe Modernization self-managed experience** , effective July 30, 2026. Existing customers can continue to use the service as normal. AWS continues to invest in security and availability improvements for AWS Mainframe Modernization self-managed experience, but we do not plan to introduce new features. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html). 
+
+**AWS Mainframe Modernization Service (Managed Runtime Environment experience)** is no longer open to new customers. For capabilities similar to AWS Mainframe Modernization Service (Managed Runtime Environment experience) explore AWS Mainframe Modernization Service (Self-Managed Experience). Existing customers can continue to use the service as normal. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html).