Workflow action Send to Slack

I’ve tried to set up workflow action for Send to Slack. I suppose that the slack token is correct because is it possible to select slack channel. But it does´t work and workflow log printed this:

Can you help me?

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In the message from Slack, there is “missing_scope” error.
Please, verify the scope for your token (write etc…).

Thank you for your answer. I added some scope and now it works.