I created a Slack bot (app) and I'm not able to send direct messages to it even though I'm pretty sure I have all the permissions enabled.
The direct message window shows Sending messages to this app has been turned off. in the input field.
Am I missing some permissions?
Go to your App Settings page and go to App Home and set the checkbox for "Allow users to send Slash commands and messages from the messages tab"
https://github.com/MicrosoftDocs/bot-docs/issues/2077#issuecomment-843960695
At the bottom you will see the option
Adding following scope worked for me:
1. mpim:write -> Start group direct messages with people
2. im:write -> Start direct messages with people