# Some customers in AWS us-east-1 may observe a small number of gRPC UNIMPLEMENTED errors

- Provider: [Temporal Cloud](https://down.guide/providers/temporal-cloud)
- Confidence: Confirmed
- Impact: Degraded
- lasted 0m
- started 2026-05-27 15:00 UTC
- us, us-east-1
- Temporal Cloud states the impact was 2026-05-27 15:00 to 15:30 UTC (30m)
- id: DWN-93dfd3d787
- Official page: https://stspg.io/rls5mhhck9f5

## Updates from Temporal Cloud
### 2026-05-27 15:00 UTC: resolved
Some customers in AWS us-east-1 may observe a small number of gRPC UNIMPLEMENTED errors returned during the time period 15:00-15:30:00 UTC.
This issue was investigated and identified as being related to a deployment in the affected region that has been rolled back - no further impact is expected.

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