diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60e2685a..428507fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Fixed
+
+- SideloadedSubtitle
+  - Fixed an issue where internal network requests would cause a user agent mismatch.
+
 ## [11.0.1] - 2026-04-21
 
 ### Fixed
diff --git a/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/AVSubtitlesLoader.swift b/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/AVSubtitlesLoader.swift
index a552d0d5..6ae35533 100644
--- a/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/AVSubtitlesLoader.swift
+++ b/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/AVSubtitlesLoader.swift
@@ -22,6 +22,7 @@ class AVSubtitlesLoader: NSObject {
     private let synchronizer: SubtitlesSynchronizer?
     private let _id: String
     private var variantTotalDuration: Double = 0
+    private var requestMap: [URL: URLRequest] = [:]
     
     init(subtitles: [TextTrackDescription], id: String, player: THEOplayer? = nil) {
         self._subtitles = subtitles
@@ -42,8 +43,8 @@ class AVSubtitlesLoader: NSObject {
     }
     #endif
 
-    func handleMasterManifestRequest(_ url: URL) async -> Data? {
-        let parser = MasterPlaylistParser(url: url)
+    func handleMasterManifestRequest(_ url: URL, request: URLRequest?) async -> Data? {
+        let parser = MasterPlaylistParser(url: url, request: request)
         guard let responseData = await parser.sideLoadSubtitles(subtitles: subtitles) else {
             print("[AVSubtitlesLoader] ERROR: Couldn't find manifest data")
             return nil
@@ -52,8 +53,8 @@ class AVSubtitlesLoader: NSObject {
         return responseData
     }
     
-    func handleVariantManifest(_ url: URL) async -> Data? {
-        let parser = VariantPlaylistParser(url: url)
+    func handleVariantManifest(_ url: URL, request: URLRequest?) async -> Data? {
+        let parser = VariantPlaylistParser(url: url, request: request)
 
         guard let playlist = await parser.parse(),
            let responseData = playlist.manifestData else {
@@ -163,8 +164,13 @@ enum URLScheme: String {
 }
 
 extension AVSubtitlesLoader: MediaPlaylistInterceptor {
-    func shouldInterceptPlaylistRequest(type: HlsPlaylistType) -> Bool { false }
-    func didInterceptPlaylistRequest(type: HlsPlaylistType, request: URLRequest) async throws -> URLRequest { request }
+    func shouldInterceptPlaylistRequest(type: HlsPlaylistType) -> Bool { true }
+    func didInterceptPlaylistRequest(type: HlsPlaylistType, request: URLRequest) async throws -> URLRequest {
+        if let url = request.url {
+            requestMap[url] = request
+        }
+        return request
+    }
 
     func failedToPerformURLRequest(request: URLRequest, response: URLResponse) {
         if THEOplayerConnectorSideloadedSubtitle.SHOW_DEBUG_LOGS {
@@ -190,11 +196,11 @@ extension AVSubtitlesLoader: MediaPlaylistInterceptor {
             // intercept the master manifest to append the subtitles
             subtitles = await validateSubtitles()
             if subtitles.isEmpty { return data }
-            return await self.handleMasterManifestRequest(url) ?? data
+            return await self.handleMasterManifestRequest(url, request: requestMap[url]) ?? data
         case .video:
             // intercept the variant manifest to get the duration
             if subtitles.isEmpty { return data }
-            return await self.handleVariantManifest(url) ?? data
+            return await self.handleVariantManifest(url, request: requestMap[url]) ?? data
         case .subtitles:
             // intercept the subtitle request to respond with the HLS subtitle
             if subtitles.isEmpty { return data }
diff --git a/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/MasterPlaylistParser.swift b/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/MasterPlaylistParser.swift
index 292fcdb5..83416ab3 100644
--- a/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/MasterPlaylistParser.swift
+++ b/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/MasterPlaylistParser.swift
@@ -12,13 +12,10 @@ class MasterPlaylistParser: PlaylistParser {
     var constructedManifestArray = [String]()
     fileprivate var lastMediaLine: Int?
     fileprivate let subtitlesGroupId = "THEOsubs"
-
-    override init(url: URL) {
-        super.init(url: url)
-    }
     
     func sideLoadSubtitles(subtitles: [TextTrackDescription]) async -> Data? {
-        guard let _ = await self.loadManifest() else { return nil }
+        let headers = request?.allHTTPHeaderFields
+        guard let _ = await self.loadManifest(headers) else { return nil }
         self.parseManifest()
         self.appendSubtitlesLines(subtitles: subtitles)
         let constructed = self.constructedManifestArray.joined(separator: "\n")
diff --git a/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/PlaylistParser.swift b/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/PlaylistParser.swift
index d50dbf81..aad3cf55 100644
--- a/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/PlaylistParser.swift
+++ b/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/PlaylistParser.swift
@@ -10,14 +10,22 @@ import Foundation
 class PlaylistParser {
     var manifestURL: URL
     var manifestData: Data?
+    let request: URLRequest?
     
-    init(url: URL) {
+    init(url: URL, request: URLRequest?) {
         self.manifestURL = url
         self.manifestData = nil
+        self.request = request
     }
     
-    func loadManifest() async -> Data? {
-        if let (data, response) = try? await URLSession.shared.data(from: self.manifestURL) {
+    func loadManifest(_ headers: [String: String]? = nil) async -> Data? {
+        var request = URLRequest(url: self.manifestURL)
+        if let headers {
+            for header in headers {
+                request.setValue(header.value, forHTTPHeaderField: header.key)
+            }
+        }
+        if let (data, response) = try? await URLSession.shared.data(for: request) {
             // Update the manifestUrl to the url received in the response (to pickup possible url redirect)
             if let responseUrl = response.url {
                 self.manifestURL = responseUrl
diff --git a/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/VariantPlaylistParser.swift b/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/VariantPlaylistParser.swift
index 72adf59d..35c533c9 100644
--- a/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/VariantPlaylistParser.swift
+++ b/Code/Sideloaded-TextTracks/Sources/THEOplayerConnectorSideloadedSubtitle/Parsers/VariantPlaylistParser.swift
@@ -11,13 +11,14 @@ class VariantPlaylistParser: PlaylistParser {
     fileprivate(set) var totalPlayListDuration: Double
     var constructedManifestArray = [String]()
     
-    override init(url: URL) {
+    override init(url: URL, request: URLRequest?) {
         self.totalPlayListDuration = 0
-        super.init(url: url)
+        super.init(url: url, request: request)
     }
     
     func parse() async -> VariantPlaylistParser? {
-        guard let _ = await self.loadManifest() else { return nil }
+        let headers = request?.allHTTPHeaderFields
+        guard let _ = await self.loadManifest(headers) else { return nil }
         self.parseManifest()
         let constructed = self.constructedManifestArray.joined(separator: "\n")
         if THEOplayerConnectorSideloadedSubtitle.SHOW_DEBUG_LOGS {