Hi, I have an email account I have managed to set up on my Outlook but despite repeated attempts on my android phone it keeps saying it cannot authenticate and to try again later.

It sounds like you are experiencing authentication issues with your Outlook app on your Android device. Here are a few troubleshooting steps that might help resolve the issue:

1. Check for TLS Version: Ensure that your Exchange server is using TLS 1.2 or later, as Outlook for Android does not support TLS 1.0 or 1.1. If your server is using an older version, you may need to update it.
2. Check AutoDiscover Endpoint: If the AutoDiscover endpoint cannot be reached, it could be due to firewall or load balancer configuration issues. Make sure that there are no IP restrictions preventing access.
3. Verify ActiveSync Configuration: Ensure that the ActiveSync endpoint is correctly configured and reachable. If there are issues with the ActiveSync endpoint, it may prevent authentication.
4. Check for Certificate Issues: If your operating system uses TLS 1.2 but you still face issues, check if there is an expired TLS certificate that might be causing the problem.
5. Use Hybrid Modern Authentication: If your organization supports it, consider deploying Hybrid Modern Authentication, which can enhance security and may help with authentication issues.

If these steps do not resolve the issue, you may want to consult additional resources or reach out to your IT support for further assistance.

References:

• The connection to your mail server timed out
• Using hybrid Modern Authentication with Outlook for iOS and Android

Hi, thanks for posting here in Microsoft community, have you tried to clear the Outlook app cache on the Android device? this often resolves lingering connection issues

let me know how it goes.

Chard

Hi thanks for reaching out again, you can simply open settings on your phone then scroll down and tap apps or Apps & notifications, depending on your device then find and select outlook from the list. tap Storage, then tap Clear Cache, avoid clear data unless you want to reset the app completely. then restart the Outlook app and try signing in again.

I hope this helps you

Chard

THanks, no it didn't work. It still says it had problems authenticating.