From https://support.cloud.google.com/portal/system-status:

Status: Fully Resolved

Product group: Google Workspace

Products affected: Admin Console, Chrome Browser, Endpoint Management

Start time: Tuesday, June 16, 2026, 10:28:15 PM GMT-07:00

End time: Tuesday, June 16, 2026, 10:28:24 PM GMT-07:00

Description: A subset of users within the EU and Americas regions may have encountered a TLS certificate pop-up while using Workspace Apps.

Steps to reproduce: Impacted users may have encountered a popup where "lh3.googleusercontent.com" is asking for a TLS certificate when using any Workspace Apps.

This issue does not impact any critical functions on the corresponding Apps, as an option to bypass the prompt is available to users.

Workaround: The issue is mitigated now.

Updates: Tuesday, June 16, 2026, 5:31:51 PM GMT-07:00:

We are investigating a potential issue with Chrome Browser.

We will provide more information by Tuesday, 2026-06-16 18:00 PDT.

Tuesday, June 16, 2026, 5:40:40 PM GMT-07:00:

We are investigating the authentication prompt issue on Chrome browser beginning on Tuesday, 2026-06-16 05:30 PDT.

Our engineering team continues to investigate the issue.

We will provide an update by Tuesday, 2026-06-16 19:00 PDT with current details.

We apologize to all who are affected by the disruption.

Tuesday, June 16, 2026, 7:05:40 PM GMT-07:00:

We are investigating the authentication prompt issue while using Workspace Apps beginning on Tuesday, 2026-06-16 05:30 PDT.

Our engineering team has identified the root cause and mitigation is currently underway. We do not have ETA for mitigation at the moment.

We will provide an update by Tuesday, 2026-06-16 20:30 PDT with current details.

Tuesday, June 16, 2026, 8:16:33 PM GMT-07:00:

We are investigating the authentication prompt issue while using Workspace Apps beginning on Tuesday, 2026-06-16 05:30 PDT.

Our engineering team has identified the root cause and mitigation is currently underway. We do not have ETA for mitigation at the moment.

We will provide an update by Wednesday, 2026-06-17 00:00 PDT with current details.

Tuesday, June 16, 2026, 10:28:15 PM GMT-07:00:

The issue with Workspace Apps has been resolved for all affected users within the EU and Americas regions as of Tuesday, 2026-06-16 19:41 PDT

From a preliminary analysis, the issue was due to a configuration error that inadvertently requested client certificates. Our engineers have mitigated the issue by fully rolling back the affected configurations to a previous working state.

We thank you for your patience while we worked on resolving the issue.