Atlassian Access features that are applicable to Bitbucket Cloud:

• Single Sign-Ons: SSO-based logins are applicable to Bitbucket Cloud. 
• Bitbucket Audit logs: We also have the Bitbucket audit logs feature that can be used along with an Atlassian Access subscription. 
  • Link Bitbucket workspace to your organization. 
  • These are the Bitbucket Audit log events currently available
  • Security teams can use the API to investigate incidents, as well as to import logs into an SIEM tool like Splunk for further monitoring and analysis. More details on the organization audit log API can be found here.

Bitbucket User Groups Management:

Syncing groups are only currently available for Jira products and Confluence and not yet available for Bitbucket and Trello. Currently, Bitbucket user group management can be done from the Bitbucket UI or using APIs.

Also note that If any user is deactivated or activated or updated from Atlassian Admin Hub, the changes are reflected in Bitbucket Cloud accounts as well. 

Unified User Management is coming soon to Bitbucket Cloud. More details are available on this blog.