backend error: invalid key: API key <KEY> not valid

### What is the issue?

I get the error: `backend error: invalid key: API key not valid`
when I try to use a pre-approved key to add my Mac book as follows:
```
tailscale up --authkey tskey-auth-xxxxx
```

### Steps to reproduce

1. Generate auth key from https://login.tailscale.com/admin/settings/keys
2. Go to mac book and run `tailscale up --authkey tskey-auth-xxxxx`
3. It did work once, but then I removed the device from the admin console and tried 5 more times, and it failed each time.

### Are there any recent changes that introduced the issue?

_No response_

### OS

macOS

### OS version

Monterey version 12.0.1

### Tailscale version

1.50.1

### Other software

_No response_

### Bug report

_No response_