> For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt.

# MyAccessID

> **Themelio compatibility reference.** This page describes the retained Themelio implementation or its historical design. Check the [parallel-operation guide](/compatibility/index.md) before applying it to the current platform.

MyAccessID is an Identity and Access Management service provided by GEANT. It offers a common Identity Layer for Infrastructure Service Domains (ISDs) and is used by Themelio (via RCIAM) to authenticate academic users through institutional identity providers.

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