Due to a bug in Confluence customers cannot use Atlas CRM when the Confluence version is installed. Atlas CRM authenticates against Confluence and this fails. Atlassian is tracking this issue via https://jira.atlassian.com/browse/CONFCLOUD-65396
We are working on it, but the problem is on Atlassian's side.
It is unclear how many Confluence instances are affected. We have some customers reporting this problem, while others are able to access Atlas CRM as expected.
As a workaround, customers can access Atlas CRM via Jira.