ShareFile Username Format Testing
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Original Username: david@cazarin.com
Subdomain: cazarin

Testing: Original = 'david@cazarin.com'
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✅ SUCCESS with format: Original
Username that worked: 'david@cazarin.com'
Token: wyhK9xXGCwvZORWgUa5p...

If none of these work, the issue might be:
1. API application doesn't support password grant type
2. Password is incorrect
3. Client credentials are wrong
4. Need to use Authorization Code flow instead