A service engineer is trying to determine why one of the company's SaaS solution is no longer available. The internal systems are responding and other online applications using the same SaaS solution

A cloud service provider outage would degrade the SaaS for all customers, but other organizations using the same SaaS are responding normally, which rules out a provider-wide outage.

An automation or orchestration issue typically affects internal provisioning or workflow pipelines, not the external availability of a SaaS application for end users.

An integration issue - such as a broken API endpoint configuration, expired OAuth token, or misconfigured middleware between the company's internal systems and the SaaS platform - would disrupt availability for only this tenant while leaving the underlying SaaS service fully operational for others. The fact that both internal systems and other customers of the same SaaS are healthy confirms the fault lies in the integration layer unique to this organization.

A subscription issue could restrict tenant access, but the scenario describes a sudden availability change with no indication of a billing or account event, making an integration failure a more common and technically specific cause.