Users can't access Excel workbooks from Power BI and receive an error message

Title: Users can't access Excel workbooks from Power BI and receive an error message User impact: Users couldn't access Excel workbooks from Power BI and received an error message. More info: Impact was specific to the September 2026 release of the Power BI desktop client and Power BI on the web. When users attempted to access Excel workbooks from Power BI, they received an error that stated, "The input couldn't be recognized as a valid Excel document." Final status: We've completed the reversion of the offending service change, and after monitoring the service, we've verified that this action successfully remediated the impact. Scope of impact: Your organization was affected by this event, and any user attempting to access Excel workbooks from the September 2026 release of the Power BI desktop client or Power BI on the web was impacted. Start time: Tuesday, September 8, 2026, at 8:00 PM UTC End time: Saturday, September 19, 2026, at 12:30 PM UTC Root cause: A recent service change designed to address a separate issue relating to relationships in Excel files caused impact. Next steps: We're investigating how the recent service change designed to address a separate issue relating to relationships in Excel files caused this impact. This is the final update for the event.

Title: Users can't access Excel workbooks from Power BI and receive an error message User impact: Users can't access Excel workbooks from Power BI and receive an error message. More info: Impact is specific to the September 2026 release of the Power BI desktop client and Power BI on the web. When users attempt to access Excel workbooks from Power BI, they receive an error that states, "The input couldn't be recognized as a valid Excel document." Current status: We've confirmed that our actions to reverse the impacting service change remediates the impact in our internal testing environment, so we're proceeding with applying this reversion to the affected users. We'll provide a timeline for the completion of this reversion as one becomes available. Scope of impact: Your organization is affected by this event, and any user attempting to access Excel workbooks from the September 2026 release of the Power BI desktop client or Power BI on the web is impacted. This information may be updated as our investigation continues. Start time: Tuesday, September 8, 2026, at 8:00 PM UTC Root cause: A recent service change designed to address a separate issue relating to relationships in Excel files is causing impact. Next update by: Saturday, September 19, 2026, at 6:00 PM UTC

Title: Users can't access Excel workbooks from Power BI and receive an error message User impact: Users can't access Excel workbooks from Power BI and receive an error message. More info: Impact is specific to the September 2026 release of the Power BI desktop client and Power BI on the web. When users attempt to access Excel workbooks from Power BI, they receive an error that states, "The input couldn't be recognized as a valid Excel document." Current status: We're testing a method of reversing the impacting change to confirm that it remediates the impact as expected before applying this change more broadly. Scope of impact: Your organization is affected by this event, and any user attempting to access Excel workbooks from the September 2026 release of the Power BI desktop client or Power BI on the web is impacted. This information may be updated as our investigation continues. Start time: Tuesday, September 8, 2026, at 8:00 PM UTC Root cause: A recent service change designed to address a separate issue relating to relationships in Excel files is causing impact. Next update by: Friday, September 18, 2026, at 11:00 PM UTC

Title: Users can't access Excel workbooks from Power BI and receive an error message User impact: Users can't access Excel workbooks from Power BI and receive an error message. More info: Impact is specific to the September 2026 release of the Power BI desktop client and Power BI on the web. When users attempt to access Excel workbooks from Power BI, they receive an error that states, "The input couldn't be recognized as a valid Excel document." Current status: We're evaluating multiple options to reverse the impacting change, so that we can determine which method will be the most efficient at remediating the impact. Scope of impact: Your organization is affected by this event, and any user attempting to access Excel workbooks from the September 2026 release of the Power BI desktop client or Power BI on the web is impacted. This information may be updated as our investigation continues. Start time: Tuesday, September 8, 2026, at 8:00 PM UTC Root cause: A recent service change designed to address a separate issue relating to relationships in Excel files is causing impact. Next update by: Friday, September 18, 2026, at 9:00 PM UTC

Title: Users can't access Excel workbooks from Power BI and receive an error message User impact: Users can't access Excel workbooks from Power BI and receive an error message. More info: Impact is specific to the September 2026 release of the Power BI desktop client and Power BI on the web. When users attempt to access Excel workbooks from Power BI, they receive an error that states, "The input couldn't be recognized as a valid Excel document." Current status: We've identified a recent service change, designed to address a separate issue relating to relationships in Excel files, that's causing impact. We're evaluating the most efficient method to reverse this change and remediate the impact. Scope of impact: Your organization is affected by this event, and any user attempting to access Excel workbooks from the September 2026 release of the Power BI desktop client or Power BI on the web is impacted. Root cause: A recent service change designed to address a separate issue relating to relationships in Excel files is causing impact. Next update by: Friday, September 18, 2026, at 7:30 PM UTC

Title: Users can't access Excel workbooks from Power BI and receive an error message User impact: Users can't access Excel workbooks from Power BI and receive an error message. More info: Impact is specific to the September 2026 release of the Power BI desktop client and Power BI on the web. When users attempt to access Excel workbooks from Power BI, they receive an error that states, "The input couldn't be recognized as a valid Excel document." Current status: We're reproducing the impact using our internal testing environment to gain clarity on the issue, so that we can determine our next steps to isolate the root cause. Scope of impact: Your organization is affected by this event, and any user attempting to access Excel workbooks from the September 2026 release of the Power BI desktop client or Power BI on the web is impacted. Next update by: Friday, September 18, 2026, at 5:30 PM UTC

Title: Users can't access Excel workbooks from Power BI and receive an error message User impact: Users can't access Excel workbooks from Power BI and receive an error message. More info: Impact is specific to the September 2026 release of the Power BI desktop client and Power BI on the web. Current status: We're investigating a potential issue with Power BI and checking for impact to your organization. We'll provide an update within 30 minutes.