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Does your BucketIAMMember declaration have a condition specified?
Can you share your code?

Untitled

You don't use the bucket id, you use the bucket name

Or if you can't change the other stack's output, just apply a lambda to drop the first 2 characters

thanks for your hint. I reviewed the code: backup_bucket_id is, in fact, the bucket name
```sky-it-backup-mysql-prod```
without 'b/'