Azure Notification Hub REST API to get all registrations using paging with continuation token not working

Hi,

I'm using the GET all registrations API and there's a lot of registrations so i'm paging using the documented x-ms-continuationtoken but, I keep getting duplicates like it's not paging. The token doesn't change in the response on each request (not sure it does) but, the point is the results are the same for each page. Am I misusing this?

I have a script I can share:

!/usr/bin/env zsh

# ===== CONFIGURATION =====
NAMESPACE="your-namespace"              # e.g. myhubnamespace
HUB_NAME="your-hub"                     # e.g. myhub
API_VERSION="2016-07"                   # Notification Hubs REST API version
OUTPUT_FILE="registrations.xml"

# Use your pre-generated SAS token here (quoted to preserve spaces)
SAS_TOKEN='SharedAccessSignature sr=....&sig=....&se=....&skn=....'

# ===== BEGIN FETCH LOOP =====
URI="https://${NAMESPACE}.servicebus.windows.net/${HUB_NAME}/registrations?api-version=${API_VERSION}"

# Clear the output file
: > "$OUTPUT_FILE"

CONTINUATION=""
PAGE=1

while true; do
  echo "Fetching page $PAGE..."

  RESPONSE_HEADERS=$(mktemp)

  if [[ -n "$CONTINUATION" ]]; then
    RESPONSE=$(curl -sS -D "$RESPONSE_HEADERS" \
      -H "Authorization: $SAS_TOKEN" \
      -H "x-ms-continuationtoken: $CONTINUATION" \
      "$URI")
  else
    RESPONSE=$(curl -sS -D "$RESPONSE_HEADERS" \
      -H "Authorization: $SAS_TOKEN" \
      "$URI")
  fi

  # Append results
  print -- "$RESPONSE" >> "$OUTPUT_FILE"

  # Extract continuation token (case-insensitive, strip CR)
  CONTINUATION=$(grep -i "x-ms-continuationtoken:" "$RESPONSE_HEADERS" | awk '{print $2}' | tr -d '\r')

  rm "$RESPONSE_HEADERS"

  if [[ -z "$CONTINUATION" ]]; then
    echo "No more pages."
    break
  fi

  (( PAGE++ ))
done