docs(claude-in-office): document allow_1p manifest param (#153)

* docs(claude-in-office): document allow_1p manifest param

* chore(claude-in-office): bump plugin version to 0.1.1

claude-for-msft-365-install/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "claude-for-msft-365-install",
   "description": "Provision direct cloud access (Vertex AI, Bedrock, or LLM gateway) for the Claude Office add-in. Generates the customized add-in manifest, walks through Azure admin consent, and writes per-user config via Microsoft Graph extension attributes.",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "author": {
     "name": "Anthropic",
     "email": "support@anthropic.com"

claude-for-msft-365-install/commands/manifest.md

@@ -161,6 +161,12 @@ Default: when all fields for a provider are set, users skip the connection form
 and land straight in chat. Ask: should they instead see the form first
 (prefilled, one click)? Yes → `auto_connect=0`.
 
+## Allow Claude.ai sign-in
+
+When any enterprise config key is present, users land on the enterprise
+connection screen and the **Back** button to Claude.ai sign-in is hidden
+(`allow_1p=0`, the default). Set `allow_1p=1` to keep the **Back** button.
+
 ## Version
 
 M365 Admin Center caches by `<Id>` + `<Version>` — re-upload with the same