Connect to Microsoft 365 changedthird-party/claude-desktop/connectors-m365
Nearest release: v2.1.322, published 20 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 10 Nov 2026 22:26 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 10 Nov 2026 22:37 UTC.
Upstream edited
Recorded here
Lines+2added
Lines−2removed
From line
230
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits24to this page, all time
The whole hunk
from line 230, old and new numbered
/
from line 230
230230
231231### Troubleshoot sign-in errors
232232
233These errors can appear during setup.
233These errors can appear during setup. For errors that this connector shares with other remote managed MCP servers, such as `Unexpected content type: text/html` in `main.log`, see [MCP server sign-in](https://claude.com/docs/third-party/claude-desktop/mcp-sign-in.md#troubleshoot-sign-in).
234234
235235| Error | Cause | Fix |
236236| - | - | - |
237| `Connection to server failed. You can try again.` with no Microsoft sign-in page, and the user's [`main.log`](https://claude.com/docs/third-party/claude-desktop/data-storage#where-data-lives) shows an HTML block page from your network, starting at the `[error]` line that contains the entry's `name` (`m365` unless you changed it) and the word `failed` | A firewall or secure web gateway blocked the request to the connector service before sign-in started | Send the block page to your network team and ask them to [allow MCP traffic to the connector service's host](#allow-the-required-network-hosts) |
237| Either `Couldn't connect to <name>. Try again later. If it keeps failing, ask your IT admin whether a firewall or proxy is blocking MCP traffic.` (Claude Desktop 5.1231.0 or later) or `Connection to server failed. You can try again.`, with no Microsoft sign-in page, and the user's [`main.log`](https://claude.com/docs/third-party/claude-desktop/data-storage#where-data-lives) shows an HTML block page from your network, starting at the `[error]` line that contains the entry's `name` (`m365` unless you changed it) and the word `failed` | A firewall or secure web gateway blocked the request to the connector service before sign-in started | Send the block page to your network team and ask them to [allow MCP traffic to the connector service's host](#allow-the-required-network-hosts) |
238238| `AADSTS50011` redirect mismatch | Redirect URI is not exactly `http://127.0.0.1/callback`, or was registered under *Web* instead of *Mobile and desktop applications* | Re-check step 2.1 |
239239| `AADSTS50194` multi-tenant required | Tenant ID is missing from the configuration | Add Tenant ID in step 4 |
240240| `AADSTS65001` admin consent required | Step 1 was not completed, or step 2.4 was skipped | Complete admin consent |
No line in this hunk matches that.