Why am I getting the "API token invalid" error?

You will need to reconnect your 2sync with Notion:

1. Go to Settings & members on your Notion workspace.

2. Click on Connections > 2sync (click on the three dots) > Disconnect account.

3. Confirm the cancellation by clicking on Yes in the pop-up window.
4. Set up the automation again to reconnect your 2sync.