AccessDeniedException

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

Linux 7.0.0-30-generic - Ubuntu 24.04.4 LTS

### Expected behaviour

Amazon Q is having trouble responding right now:
0: Failed to send the request: An unknown error occurred: AccessDeniedException
1: An unknown error occurred: AccessDeniedException
2: unhandled error (AccessDeniedException)
3: service error
4: unhandled error (AccessDeniedException)
5: Error { code: "AccessDeniedException", message: "User is not authorized to make this call.", aws_request_id: "cc4dddb2-31b6-4a1e-bf77-a8b09d55f3eb" }

Location:
crates/chat-cli/src/cli/chat/mod.rs:1149

Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.

### Actual behaviour

Amazon Q is having trouble responding right now:
0: Failed to send the request: An unknown error occurred: AccessDeniedException
1: An unknown error occurred: AccessDeniedException
2: unhandled error (AccessDeniedException)
3: service error
4: unhandled error (AccessDeniedException)
5: Error { code: "AccessDeniedException", message: "User is not authorized to make this call.", aws_request_id: "cc4dddb2-31b6-4a1e-bf77-a8b09d55f3eb" }

Location:
crates/chat-cli/src/cli/chat/mod.rs:1149

Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.

### Steps to reproduce

Amazon Q is having trouble responding right now:
0: Failed to send the request: An unknown error occurred: AccessDeniedException
1: An unknown error occurred: AccessDeniedException
2: unhandled error (AccessDeniedException)
3: service error
4: unhandled error (AccessDeniedException)
5: Error { code: "AccessDeniedException", message: "User is not authorized to make this call.", aws_request_id: "cc4dddb2-31b6-4a1e-bf77-a8b09d55f3eb" }

Location:
crates/chat-cli/src/cli/chat/mod.rs:1149

Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.

### Environment

```yaml

[q-details]
version = "1.19.7"
hash = "b654a1beb880951dd2343120bb867659622eecd9"
date = "2025-11-15T20:13:03.579285Z (283d ago)"
variant = "minimal"

[system-info]
chip = "Intel(R) Core(TM) i5-10310U CPU @ 1.70GHz"
total-cores = 4
memory = "15.40 GB"

[system-info.os.linux]
kernel_version = "7.0.0-30-generic"
id = "ubuntu"
name = "Ubuntu"
pretty_name = "Ubuntu 24.04.4 LTS"
version_id = "24.04"
version = "24.04.4 LTS (Noble Numbat)"

[environment]
cwd = "/home/USER"
cli-path = "/home/USER"
os = "Linux"
shell-path = "/usr/bin/bash"
shell-version = "5.2.21"
terminal = "Gnome Terminal"
install-method = "unknown"

[env-vars]
DISPLAY = ":0"
PATH = "/home/USER/.local/bin:/home/USER/.opencode/bin:/snap/android-studio/236/jbr/bin:/usr/lib/jvm/java-17-openjdk-amd64/bin:/home/USER/.nvm/versions/node/v18.20.8/bin:/home/USER/.nvm/versions/node/v18.20.8/bin:/home/USER/.local/bin:/home/USER/.local/share/solana/install/active_release/bin:/home/USER/.local/bin:/home/USER/.opencode/bin:/snap/android-studio/236/jbr/bin:/usr/lib/jvm/java-17-openjdk-amd64/bin:/home/USER/.nvm/versions/node/v24.15.0/bin:/home/USER/.nvm/versions/node/v18.20.8/bin:/home/USER/.local/bin:/home/USER/.local/share/solana/install/active_release/bin:/home/USER/.nvm/versions/node/v24.15.0/bin:/home/USER/.local/share/solana/install/active_release/bin:/home/USER/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin"
QTERM_SESSION_ID = "22e137d0ec2b47958a3574972a396b8e"
QT_IM_MODULE = "ibus"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.19.7"
SHELL = "/bin/bash"
TERM = "xterm-256color"
XDG_CURRENT_DESKTOP = "ubuntu:GNOME"
XDG_SESSION_DESKTOP = "ubuntu"
XDG_SESSION_TYPE = "wayland"
XMODIFIERS = "@im=ibus"
```

Bắt đầu tại crates/chat-cli/src/cli/chat/mod.rs:1149 và tái hiện lỗi với các kiểm tra q doctor và q restart đã được báo cáo. Truy vết yêu cầu nào trả về AccessDeniedException và xác minh ngữ cảnh ủy quyền AWS áp dụng. Issue không cung cấp cách sửa cụ thể hay tiêu chí chấp nhận, vì vậy việc hoàn tất không được định nghĩa vượt quá việc xác định và xử lý lời gọi không được ủy quyền.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.