diff --git a/include/assume_role b/include/assume_role
index 9e43c0b3..462e0062 100644
--- a/include/assume_role
+++ b/include/assume_role
@@ -31,13 +31,13 @@ assume_role(){
         # assume role command
         $AWSCLI $PROFILE_OPT sts assume-role --role-arn arn:${AWS_PARTITION}:iam::$ACCOUNT_TO_ASSUME:role/$ROLE_TO_ASSUME \
             --role-session-name ProwlerAssessmentSession \
-            --region $REGION \
+            --region $REGION_FOR_STS \
             --duration-seconds $SESSION_DURATION_TO_ASSUME > $TEMP_STS_ASSUMED_FILE 
     else 
         $AWSCLI $PROFILE_OPT sts assume-role --role-arn arn:${AWS_PARTITION}:iam::$ACCOUNT_TO_ASSUME:role/$ROLE_TO_ASSUME \
             --role-session-name ProwlerAssessmentSession \
             --duration-seconds $SESSION_DURATION_TO_ASSUME \
-            --region $REGION \
+            --region $REGION_FOR_STS \
             --external-id $ROLE_EXTERNAL_ID > $TEMP_STS_ASSUMED_FILE 
     fi 
 
diff --git a/include/whoami b/include/whoami
index e23cfe59..03a40fa7 100644
--- a/include/whoami
+++ b/include/whoami
@@ -13,8 +13,30 @@
 
 
 # Get whoami in AWS, who is the user running this shell script
-GETCALLER=$($AWSCLI sts get-caller-identity $PROFILE_OPT --region $REGION)
-ACCOUNT_NUM=$(echo $GETCALLER | jq -r '.Account')
+# Get a list of all available AWS Regions
+# sice describe-regions doesn't seem to work at me-south-1|eu-south-1|ap-east-1|af-south-1.
+# Probably dased on https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp_enable-regions.html
+# when invoking regions with -r, those regions with STS disabled make GETCALLER fail then
+# this if will filter them out (Africa (Cape Town), Asia Pacific (Hong Kong), Europe (Milan) and Middle East (Bahrain) ):
+
+
+case "$REGION" in
+  me-south-1|eu-south-1|ap-east-1|af-south-1)
+    REGION_FOR_STS="us-east-1"
+  ;;
+  *)
+    REGION_FOR_STS=$REGION
+  ;;
+esac
+
+GETCALLER=$($AWSCLI sts get-caller-identity $PROFILE_OPT --region $REGION_FOR_STS)
+
+if [[ $ACCOUNT_TO_ASSUME ]]; then
+  ACCOUNT_NUM=$ACCOUNT_TO_ASSUME
+else
+  ACCOUNT_NUM=$(echo $GETCALLER | jq -r '.Account')
+fi
+
 CALLER_ARN=$(echo $GETCALLER | jq -r '.Arn')
 USER_ID=$(echo $GETCALLER | jq -r '.UserId')
 AWS_PARTITION=$(echo $CALLER_ARN| cut -d: -f2)
@@ -28,10 +50,6 @@ getWhoami(){
           exit $EXITCODE
   fi
 
-  if [[ $ACCOUNT_TO_ASSUME ]]; then
-    ACCOUNT_NUM=$ACCOUNT_TO_ASSUME
-  fi
-
   if [[ "$MODE" == "csv" ]]; then
     if [[ 255 -eq $? ]]; then
       # Failed to get own identity ... exit
diff --git a/prowler b/prowler
index 368623d6..2f3d40da 100755
--- a/prowler
+++ b/prowler
@@ -236,12 +236,8 @@ trap handle_ctrl_c INT
 . $PROWLER_DIR/include/securityhub_integration
 . $PROWLER_DIR/include/junit_integration
 
-# Get a list of all available AWS Regions
-REGIONS=$($AWSCLI ec2 describe-regions --query 'Regions[].RegionName' \
-  --output text \
-  $PROFILE_OPT \
-  --region $REGION \
-  --region-names $FILTERREGION)
+# Get list of regions based on include/whoami
+REGIONS=$($AWSCLI ec2 describe-regions --query 'Regions[].RegionName' --output text $PROFILE_OPT --region $REGION_FOR_STS --region-names $FILTERREGION)
 
 # Pre-process whitelist file if supplied
 if [[ -n "$WHITELIST_FILE" ]]; then