diff --git a/earthaccess/api.py b/earthaccess/api.py
index 4ef8598d..843aba65 100644
--- a/earthaccess/api.py
+++ b/earthaccess/api.py
@@ -12,6 +12,21 @@
 from .utils import _validation as validate
 
 
+def _normalize_location(location: Union[str, None]) -> Union[str, None]:
+    """Handle user-provided `daac` and `provider` values
+
+    These values must have a capital letter as the first character
+    followed by capital letters, numbers, or an underscore. Here we
+    uppercase all strings to handle the case when users provide
+    lowercase values (e.g. "pocloud" instead of "POCLOUD").
+
+    https://wiki.earthdata.nasa.gov/display/ED/CMR+Data+Partner+User+Guide?src=contextnavpagetreemode
+    """
+    if location is not None:
+        location = location.upper()
+    return location
+
+
 def search_datasets(
     count: int = -1, **kwargs: Any
 ) -> List[earthaccess.results.DataCollection]:
@@ -170,6 +185,7 @@ def download(
     Returns:
         List of downloaded files
     """
+    provider = _normalize_location(provider)
     if isinstance(granules, DataGranule):
         granules = [granules]
     try:
@@ -194,6 +210,7 @@ def open(
     Returns:
         a list of s3fs "file pointers" to s3 files.
     """
+    provider = _normalize_location(provider)
     results = earthaccess.__store__.open(granules=granules, provider=provider)
     return results
 
@@ -215,10 +232,8 @@ def get_s3_credentials(
     Returns:
         a dictionary with S3 credentials for the DAAC or provider
     """
-    if daac is not None:
-        daac = daac.upper()
-    if provider is not None:
-        provider = provider.upper()
+    daac = _normalize_location(daac)
+    provider = _normalize_location(provider)
     if results is not None:
         endpoint = results[0].get_s3_credentials_endpoint()
         return earthaccess.__auth__.get_s3_credentials(endpoint=endpoint)
@@ -315,6 +330,8 @@ def get_s3fs_session(
     Returns:
         class s3fs.S3FileSystem: an authenticated s3fs session valid for 1 hour
     """
+    daac = _normalize_location(daac)
+    provider = _normalize_location(provider)
     if results is not None:
         endpoint = results[0].get_s3_credentials_endpoint()
         if endpoint is not None:
diff --git a/tests/integration/test_auth.py b/tests/integration/test_auth.py
index a61f3513..d1bfae1e 100644
--- a/tests/integration/test_auth.py
+++ b/tests/integration/test_auth.py
@@ -6,6 +6,7 @@
 
 import earthaccess
 import pytest
+import s3fs
 
 logger = logging.getLogger(__name__)
 assertions = unittest.TestCase("__init__")
@@ -94,3 +95,24 @@ def test_auth_can_fetch_s3_credentials():
                 print(
                     f"An error occured while trying to fetch S3 credentials for {daac['short-name']}: {e}"
                 )
+
+
+@pytest.mark.parametrize("location", ({"daac": "podaac"}, {"provider": "pocloud"}))
+def test_get_s3_credentials_lowercase_location(location):
+    activate_environment()
+    earthaccess.login(strategy="environment")
+    creds = earthaccess.get_s3_credentials(**location)
+    assert creds
+    assert all(
+        creds[key]
+        for key in ["accessKeyId", "secretAccessKey", "sessionToken", "expiration"]
+    )
+
+
+@pytest.mark.parametrize("location", ({"daac": "podaac"}, {"provider": "pocloud"}))
+def test_get_s3fs_session_lowercase_location(location):
+    activate_environment()
+    earthaccess.login(strategy="environment")
+    fs = earthaccess.get_s3fs_session(**location)
+    assert isinstance(fs, s3fs.S3FileSystem)
+    assert all(fs.storage_options[key] for key in ["key", "secret", "token"])