By default, only workspace owners and administrators can deploy apps. However, specific users and user groups can be authorized in your workspace settings. Administrators can also grant this permission to any non-guest team member.
In case From scratch option is selected, name the App, select the relevant namespace, and click Create App button.
Create new app
Navigate to the OAuth & Permissions tab.
Go to Scopes and click on the Add an OAuth Scope button.
Select the following options from the drop-down list:
chat:write.public
chat:write
channels:read
conversations.list
Click on the Add Scopes button.
Scroll up and click the Install to Workspace. Once this step is done, slack_token will appear.