Can't log into Outlook (Via the Outlook app)

Maybe the Internet connection you are connected to is unstable, and is the reason why you can't log in to Outlook. To test if this is the case, you can try accessing another websites (e.g. Google, Bing, Yahoo etc). If you can't access other websites or have difficulties in accessing them, it is probably an issue related to the Internet connection. Once your Internet connection is stable again, you should be able to access Outlook.

Tips to improve the stability of your Internet connection include:

• Put your router in a central position of your home, closer to your devices;
• Buy a signal booster (if you live in a house);
• Buy a stronger router.
  
  

Also, feel free to check the guides below, which can assist you with resolving a wide variety of issues related to the Internet connection:

- No internet connection
- Slow internet connection

Maybe the reason why you can't log in to Outlook is that you haven't entered the correct username and password. It is possible that you have changed the password, but you failed to update the password everywhere else where you access Outlook from.

Verify that you have entered the correct username and password and try logging in again.

It is possible that Outlook has been accidentally blocked by the firewall or antivirus because they mistakenly consider it a threat, which would be a reasonable explanation why you can't log in to Outlook. 

Open the firewall or antivirus settings and check if you can see Outlook on a list of blocked items. If Outlook was on the list, you should remove it from the list, after which you should be able to log in to Outlook again.

Updating apps is more than just having the latest version installed. It's also having the latest bug fixes, performance updates, as well as trends. It's also ensuring that the app will communicate with the provider's server properly (which is the case with Outlook). Maybe the Outlook app is outdated, to the extent that it can't connect to the Outlook server.

Updating the Outlook app to the latest version is a must, so that you can keep using it seamlessly. Check for updates in the respective app stores and update the Outlook app to the latest version.

If you are not sure how to update apps, the how to update programs/applications guide is what you need to look into.

Maybe Outlook have technical difficulties with their servers. This is almost next to impossible, however, it should be also taken into consideration. In this case, there is nothing you can do but to wait until the difficulties have been resolved. You can always contact the Outlook team for more details, too.

Issues with the Outlook app can be resolved if you close the app via the app switcher and open it again. To close apps via the app switcher, follow the steps below:

1. Press the Home button twice, or swipe up from the bottom of the screen (for iPhone X and newer);
2. Find the Outlook app in the list, swipe up over it.
   
   

Here is a video tutorial of how to close apps through the app switcher:

If the Outlook app doesn't work properly, you can restart it, i.e. "force-stop" it via Settings and then open it again. To force-stop apps, feel free to follow the below-mentioned steps:

1. Go to Settings and tap on Apps;
   
   

       
   
   

2. Tap on Outlook from the list, and then tap on Force stop;
   
   

       

Note: The steps mentioned above may differ, depending on the device manufacturer.

Bad app data and cache files can be the reason for you being unable to log in to Outlook app as the files may be corrupt. What you need to do in this case is to clear the app data and cache files of the Outlook app, by following the instructions below: 

1. Go to Settings;
2. Tap on Apps/Applications Manager;
3. Tap on Outlook from the list and tap on the Clear data and Clear cache buttons;
   

   

You may also watch the video tutorial below shares how to clear app data and cache files (taken on a Samsung Galaxy device, running on Android OS 8 - steps may vary from one device to another):