diff --git a/eodag/api/core.py b/eodag/api/core.py
index 0ce2f7f..c3f8cfe 100644
--- a/eodag/api/core.py
+++ b/eodag/api/core.py
@@ -871,6 +871,9 @@ class EODataAccessGateway(object):
         if product_type is None:
             try:
                 guesses = self.guess_product_type(**kwargs)
+                # DEBUG: Print what we're working with
+                logger.info(f"guess_product_type called with {kwargs}")
+                logger.info(f"guess_product_type returned {guesses}")
 
                 # guess_product_type raises a NoMatchingProductType error if no product
                 # is found. Here, the supported search params are removed from the
@@ -886,16 +889,17 @@ class EODataAccessGateway(object):
 
                 # By now, only use the best bet
                 product_type = guesses[0]
+                logger.info(f"Setting product_type to {product_type}")
+                kwargs["productType"] = product_type
             except NoMatchingProductType:
                 queried_id = kwargs.get("id", None)
                 if queried_id is None:
                     logger.info(
                         "No product type could be guessed with provided arguments"
                     )
+                    logger.debug(f"guess_product_type failed with kwargs: {kwargs}")
                 else:
                     return kwargs
-
-        kwargs["productType"] = product_type
         if start is not None:
             kwargs["startTimeFromAscendingNode"] = start
         if end is not None: