I lost ability to access my att.net email account via desktop and outlook mobile

Question

I lost ability to access my att.net email account via desktop and outlook mobile

Ruben Martinez 10

My att.net email account is not authentication (syncing) on my desktop MS 365 and mobile outlook account.

Maria Turner 0 Reputation points

2026-10-06T15:19:44.6633333+00:00

I can't even get logged in because Outlook upgraded the software and it gets stuck trying to login. If I try to re-add the account, it tells me it already exists. I don't get past the install-like screen that pops up telling me it's finishing the update. So, there's no way to go in and delete the account and re-add it.
Hornblower409 16,770 Reputation points

2026-10-08T16:17:25.8166667+00:00

@Maria Turner said

I can't even get logged in because Outlook upgraded the software

I don't think you have the same problem as the original Question on this thread.

I would suggest that you start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem.

This provides much higher visibility to your issue than adding on to an existing post, which is only seen by people who are already following this question.
Sarah Contreras-Barbour 0 Reputation points

2026-10-10T06:56:53.6266667+00:00

I am having the same issue...It is so annoying. It wasn't broken so why fix it.
Hornblower409 16,770 Reputation points

2026-10-10T07:22:35.43+00:00

@Sarah Contreras-Barbour said

I am having the same issue

I would suggest that you start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem. This provides much higher visibility to your issue than adding on to an existing post, which is only seen by people who are already following this question.

(You can put the link for this page in your new Question for reference)

2 answers

Your answer

Maria Turner 0 Reputation points

2026-10-06T15:19:44.6633333+00:00

I can't even get logged in because Outlook upgraded the software and it gets stuck trying to login. If I try to re-add the account, it tells me it already exists. I don't get past the install-like screen that pops up telling me it's finishing the update. So, there's no way to go in and delete the account and re-add it.
Hornblower409 16,770 Reputation points

2026-10-08T16:17:25.8166667+00:00

@Maria Turner said

I can't even get logged in because Outlook upgraded the software

I don't think you have the same problem as the original Question on this thread.

I would suggest that you start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem.

This provides much higher visibility to your issue than adding on to an existing post, which is only seen by people who are already following this question.
Sarah Contreras-Barbour 0 Reputation points

2026-10-10T06:56:53.6266667+00:00

I am having the same issue...It is so annoying. It wasn't broken so why fix it.
Hornblower409 16,770 Reputation points

2026-10-10T07:22:35.43+00:00

@Sarah Contreras-Barbour said

I am having the same issue

I would suggest that you start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem. This provides much higher visibility to your issue than adding on to an existing post, which is only seen by people who are already following this question.

(You can put the link for this page in your new Question for reference)

Answer 1

For an att.net account failing in both Classic Outlook on desktop and Outlook mobile, the supported guidance is:

Update or re-add the account using Modern Authentication
- In non-Microsoft email apps, older authentication methods can stop working.
- If the app offers an Outlook.com option when adding the account, use that.
- If the app does not support Modern Authentication, switching to the Outlook app is recommended.
In Outlook mobile, reset the account first
- Open Outlook app > Settings > tap the account that is not syncing > Reset Account.
- Check whether mail starts syncing again.
If reset does not help, delete and re-add the account in Outlook mobile
- In Outlook app > Settings > tap the affected account > Delete Account > Delete From This Device.
- Then add the account again.
If calendar or contacts are also affected, make sure the account is not added as IMAP or POP
- IMAP and POP do not sync calendars and contacts.
- Re-add the account as Exchange ActiveSync or Exchange if that option is available.
If the issue started suddenly after it worked before, check whether the problem is service-side or app-specific
- If mail works on a computer but not on mobile, the issue may be with the email app.
- For Outlook.com or Microsoft 365 accounts, Microsoft recommends checking service status for outages. For non-Microsoft providers such as att.net, provider support may also be required.
If sign-in prompts keep recurring in Outlook mobile, install the latest Outlook app version
- Recurring prompts can happen after security standards are updated.

Because att.net is a non-Microsoft account, if re-adding the account still fails, the next step is to contact the att.net email provider for account-specific sign-in or server-setting issues.

Answer 2

Hi Ruben Martinez

Since the issue is occurring in both Outlook desktop and Outlook mobile, the first thing to verify is whether you can still sign in directly to your AT&T webmail account. If webmail works, try removing and re-adding the account in Outlook using AT&T's current IMAP settings and a Secure Mail Key instead of your regular password, as AT&T requires this for many third-party email apps.

If authentication still fails after re-adding the account, the issue is likely on the AT&T account or mail-service side, and you would need to contact AT&T support for account-specific assistance.