Microsoft 365 Alert – Service Degradation – Power BI – Some users using the January 2026 Report Server version (1.25.9508.3237) may have encountered access issues – RESOLVED

Announcements Arpan Das

26/02/2026 8:38:00 AM

NHSmail Reference: INC46758942

Microsoft Reference: PB1238769

Issue Status: RESOLVED

Issue Description: Users using the January 2026 Report Server version (1.25.9508.3237) may have encountered access issues.

More info: Users using the January 2026 Report Server version (1.25.9508.3237) may have encountered access issues, as certain reports may have triggered excessive crash dump generation on disks. As a workaround, users could have downgraded to the September 2025 version (1.15.8377.1837) or deleted the generated crash dump files due to a known limitation.

Final Update: 26/02/2026 8:35:00 AM – Microsoft has determined that an issue with the January 2026 Report Server version (1.25.9508.3237) may have caused access issues, as certain reports could have triggered excessive crash dump generation on disk. They have reverted to the previous working version September 2025 version (1.15.8377.1837), which has remediated impact.

Scope of impact: Impact was specific to users using the January 2026 Report Server version (1.25.9508.3237).

Root cause: An issue with the January 2026 Report Server version (1.25.9508.3237) may have caused access issues, as certain reports could have triggered excessive crash dump generation on disk.

Next Steps: Microsoft are continuing to identify the underlying root cause of impact within the January 2026 Report Server version (1.25.9508.3237) and they are reviewing their update procedures to better identify similar issues during their development and testing cycles.