Fix: Claude TickTick MCP 401 Error

401 Unauthorized | TickTick authentication failed | MCP OAuth invalid

// The error

TickTick's MCP server returns 401 on every request in Claude and Cursor. You authorized the connection, it looked like it worked, but every tool call fails with an authentication error. This is a widely reported issue affecting users across multiple MCP clients.

// Why it happens

TickTick's MCP server uses OAuth 2.0 with Dynamic Client Registration (DCR). This is the same pattern Notion uses, and it's notoriously difficult for MCP clients to handle correctly.

The problem chain: the MCP client registers a temporary client ID via DCR, uses it to get an OAuth token, and then needs to keep track of both the client registration and the token. If either expires or the client loses track of the DCR registration, every subsequent request returns 401.

Claude and Cursor both struggle with DCR-based OAuth flows. The client may complete the initial authorization successfully but fail to maintain the session, resulting in 401 errors on the very first tool call.

// How Bindify fixes it

Bindify handles TickTick's DCR registration and OAuth token management for you. You authorize TickTick once through Bindify's dashboard, and Bindify maintains the connection on your behalf — handling DCR client rotation and token refresh automatically.

Claude connects to your permanent Bindify URL, which always has a valid TickTick token ready. No more 401 errors. No more broken task management.

You can also skip OAuth entirely and use a TickTick API token instead. Go to TickTick Settings → API Token, copy it, and paste it into Bindify. Same permanent URL, no OAuth dance at all.