Outlook Android App error occurred during authentication. Please try again later.

Hi sershcher

Thank you for posting on the Microsoft Community Forum. I hope you're doing well.

I understand that you're experiencing this issue with the Outlook Android app. Based on the information you've provided, it seems that the error occurred during the authentication process, which could be caused by a number of factors such as incorrect login credentials, server issues, or outdated app version.

To troubleshoot this issue, I would suggest the following steps:

1. Check your login credentials: Please ensure that you are entering the correct email address and password associated with your Outlook account. You can try resetting your password to ensure that you have the correct login credentials.
2. Check your internet connection: Please ensure that you have a stable internet connection and that your device is connected to the internet. You can try switching to a different network or resetting your network settings.
3. Update the Outlook app: Please ensure that you have the latest version of the Outlook app installed on your device. You can check for updates in the Google Play Store and install any available updates.

4: Uninstall and reinstall the Outlook application.

If none of these steps work, please let me know and we can explore other options.

Sincerely,

ReynaldoB

Microsoft Community Forum Moderator

Hello sershcher!

We haven't heard from you in 72 hours, so we assume that your issue has already been resolved. We will not be monitoring this thread moving forward so, if you need further assistance, please create a new thread to discuss these concerns by clicking this link: Create a new question or start a discussion (microsoft.com)

Thank you for your understanding. 

Sincerely

ReynaldoB

Microsoft Community Forum Moderator

Hello ReynaldoB,

I have the same problem with my corporate email. (on premise exchange 2019)

1. Outlook app is up to date, mobile is up to date. Issue on Android and IOS (both)
2. Login Credentials are absolutely fine, as I can login in desktop outlook and OWA
3. Internet connection also 5G connection. (Tested with Wifi aswell)
4. My corporate email is working on native mobile apps (Android and IOS)
5. Outlook app is working hotmail.
6. There is no other Microsoft products installed on mobile (Authenticator, teams or skype)

Today i am the some probkem.

Last week, it is fine.

I don't make any changes.

Outlook woks in my desktop, but now don't work in android phone.

Thanis.

Found the fix, I don't know if Microsoft added more servers outside of the US or something but we added 2 IP's from Microsoft to let them through our firewall, then when logging in we put the "server name" skip the "domain name" and for the "Username" Just put the users email address and we are now able to login on the IOS/Android Outlook apps. Hopefully it helps all of you.