One of the main reasons that can cause this issue is the servers going through some problems. However, the problem might be occurring locally due to corrupted files that affect the integrity of the game.  Here is a list of all the methods that you can use to fix this issue on your mobile phone: 

1. Check for server issue

The first thing you need to do is to check the server’s status to see if that’s the problem. Most of the time, the COD Mobile Authorization Error 270FD309 is caused by a problem with the main matchmaking server or planned maintenance. Most likely, the central server for finding matches is down or being worked on, and developers are working to fix it. You can use sites like Downdetector to check the server’s status and see if others have reported problems with the server. This site will tell you how many reports have been made in the last 24 hours. This will tell you if other people are also getting the COD Mobile Authorization Error 270FD309 or if it’s just happening to you. If you see that the server is having problems, you can also learn more about the server problem using social media. Go to the Twitter page for Call of Duty to see if the developers have said anything. You will often find updates about ongoing game issues if any. Note: If you found recent posts about server problems, read the comments to see what people say about it. If you can confirm a problem with the server and other people are also getting the COD Mobile Authorization Error 270FD309, you can only wait until the developers fix it. Check Call of Duty’s Twitter page often and start the game up again every so often to see if the problem has been fixed. If you can’t find a server problem to blame for the COD Mobile Authorization Error 270FD309, go to the next method for additional troubleshooting strategies

2. Change the correct Date & Time

The next thing you can do is ensure the date and time on your mobile phone are correct. If the date and time are incorrect, the game might be affected because it can’t connect to the servers. You must go to your phone’s settings and ensure the date and time are automatic. Here is how you can do this, depending on the operating system that you’re using:

2.1 Set the correct date and time on the Android

Here is how you can check to see if the date and time are correct on your Android phone:

2.2 Set the correct date and time on iOS

In case you are an iOS user, here are the steps you need to follow to set the correct date and time on your device: In case the COD Mobile Authorization error 270FD309 still occurs, go to the following method.

3. Log in on the guest account

Another thing that you can try is to log in with a guest account. This method has helped many players access accounts previously displaying the error 270FD309. All you have to do when you are on the main menu is to select the Guest button. This will automatically try to let you join as a guest.  Update: According to some players experiencing this issue, tapping on guest might automatically log you into your Call of Duty account if the credentials are already saved.  If the COD Mobile Authorization error 270FD309 still appears, or nothing has happened after you’ve done that, check the next possible method.

4. Remove the game cache 

Corrupted files might also cause this particular error in Call of Duty Mobile. This might happen because some cache data stored in your phone has become harmful to the game. All you have to do is to remove the game cache. Note: This won’t affect your game in any way because the game’s cache is composed of temporary files that are not necessary to run the game. Here are the guides that will show you how to remove the game cache depending on your phone:

4.1 Remove game cache on Android

In case you are using an Android phone, here are the steps you need to follow:

4.2 Remove game cache on iOS

IOS doesn’t have a function that allows users to clear the cache. The best thing you can do is to offload the game. Here’s how you can do it: If you’ve removed the game’s cache and the COD Mobile Authorization error 270FD309 still occurs, go to the next method.

5. Reinstall the game 

The next thing you can do if the problem still appears is uninstall and reinstall the game. This process will eliminate all the files associated with the game and reinstall a fresh equivalent of the files.  You don’t have to worry because your account won’t be deleted. After you reinstall the game, you can log in to your account if the issue has been fixed. Here’s a guide for both Android and iOS phones:

5.1 Reinstalling the game on Android

Follow the next steps to reinstall the game on Android phones:

5.2 Reinstalling the game on iOS

You can uninstall and reinstall the game on your iOS phone by following the next steps: If neither of the issues before has fixed your COD Mobile Authorization error 270FD30, check the next and last method.

6. Grant Full Background access & Required permissions (Android)

The last thing you can try is to grant full Background access and required permissions to ensure that the game is working properly. This can be done from the settings of Call of Duty Mobile. Note: This method is only available for Android users because these settings are unavailable on iOS. You must go to the Data Usage settings of Call of Duty Mobile and activate the options. Here’s how you can do this:

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