Trying to elaborate for this (very remote) scenario:
Our Jira organization has SSO enabled. For some reason, the IdP becomes unavailable and users need to login. Is there a way to bypass SSO authentication? Or are we condemned to wait until the issue is solved?
This is important to identify so that our current DRP/BCP plans include accurate guidelines on what to do/expect.
SSO with Atlassian Cloud is enabled for users on your verified domain. I would suggest you add an org admin outside your verified domain.
If IDP becomes unavailable, this user can log in as org admin and disable SSO via authentication policies under Security --> Authentication policies.
Disabling SSO will allow users to login via their Atlassian Account username/password.
Suppose you can't add an org admin outside your domain. Create a new authentication policy with SSO disabled and add an org admin user to this policy. This user will be able to log in without SSO and will be able to disable SSO if IDP is unavailable.