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

Testing: Original = 'david@cazarin.com'
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❌ Failed (HTTP 400)
Error: invalid_grant
Description: invalid username or password

Testing: With Domain = 'david@cazarin.com@cazarin.sharefile.com'
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❌ Failed (HTTP 400)
Error: invalid_grant
Description: invalid username or password

Testing: With ShareFile Domain = 'david@cazarin.com@sharefile.com'
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❌ Failed (HTTP 400)
Error: invalid_grant
Description: invalid username or password

Testing: Email Format = 'david@cazarin.com@cazarin.com'
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❌ Failed (HTTP 400)
Error: invalid_grant
Description: invalid username or password

Testing: Just Username = 'david@cazarin.com'
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❌ Failed (HTTP 400)
Error: invalid_grant
Description: invalid username or password

Testing: Lowercase = 'david@cazarin.com'
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❌ Failed (HTTP 400)
Error: invalid_grant
Description: invalid username or password

Testing: Uppercase = 'DAVID@CAZARIN.COM'
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❌ Failed (HTTP 400)
Error: invalid_grant
Description: invalid username or password

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