I am trying to integrate the Bitbucket server as suggested in the documentation. I successfully set up global ALM integration settings. Please see the attached screenshots.
You can see in your first screenshot that Import repositories from your ALM is marked as Disabled. The ? next to that text should give you some more information. Do you have multiple BitBucket instances configured in SonarQube (with Enterprise Edition)?
Unfortunately for your use case, SonarQube currently has a limitation for this functionality: if multiple instances are configured, it’s not possible to use the Project Create mechanism. This is slightly hidden in our documentation: look in the Configuring multiple DevOps Platform instances callout under Advanced configuration in this documentation