Otherwise it's hard to tell which region has the problem, and lines look like duplicates:
{"message":"Requested connection via arn:aws:iam::ACCOUNT:role/TargetRole"
{"message":"Assuming role arn:aws:iam::ACCOUNT:role/TargetRole..."
{"message":"Unable to assume role arn:aws:iam::ACCOUNT:role/TargetRole on 658730722470: AccessDenied: User: arn:aws:sts::ACCOUNT:assumed-role/TargetRole
Otherwise it's hard to tell which region has the problem, and lines look like duplicates: