{"version":"2.1.315","anchor":"mcp-authenticate-re-checks-policy-and-account-identity","canonical_anchor":"mcp-authenticate-re-checks-policy-and-account-identity","heading":"MCP sign-in stops if your organization blocks it or your account changes midway","tier":"notice","area":"MCP","scope":"both","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.315\/e\/mcp-authenticate-re-checks-policy-and-account-identity","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.315","markdown":"### MCP sign-in stops if your organization blocks it or your account changes midway\n\n`mcp_authenticate` now checks organization policy again just before sign-in starts, and stops if your Claude account changed meanwhile\n\n**What**\n\n`mcp_authenticate` signs in to an MCP server, an outside service that gives Claude extra tools. It now checks your organization's managed policy again right before it starts the sign-in, and again when it falls back to a custom redirect address. Before, it checked policy only once, at the start.\n\nIt also now stops if the Claude account you are signed in with changes while the sign-in is starting. The error says the Claude account changed while sign-in to the MCP server was starting, and asks you to try again.\n\n**Why**\n\nSign-in can no longer go through if a policy block or an account switch happens in the moment between the first check and the sign-in itself.\n\n- Area: MCP\n- Names: `mcp_authenticate`\n- Tier: You'll notice\n- Useful: 1\/5\n- Signal: 1\/5\n- Scope: both\n- Heads-up: no"}