Login Issue

Question

Login Issue

Jawad Almubarak 5

I am trying to sign in to teams and the rest of the windows apps with my work/school account, but it doesn't show me the password screen, it only shows me the 404 http error and then when I close that it shows me error 2603. When I try using my personal account or on the web versions of the apps, it works flawlessly.

If anyone knows a surefire solution please share it.

Thanks

Moderator note: See the similar thread at https://learn.microsoft.com/en-us/answers/questions/5993729/browser-word-not-working .

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Answer 1

Alina Le 4,920 Independent Advisor

Hello Jawad,

To help narrow down the issue, might I confirm the following:

1/ Might I confirm whether this issue occurred from the first sign-in attempt, or was the account previously working normally on this device before it started happening?

2/ Besides Teams, do you see the same behavior in other Microsoft 365 desktop apps such as OneDrive, Outlook, Word, or Excel?

3/ Could you share a screenshot of the HTTP 404 error and Error 2603? Please remove any personal information before posting it publicly to protect your personal information.

4/ Is this account provided by your school or organization, and are any other users experiencing the same issue?

Besides, I'd like to share a few troubleshooting steps and some screenshots I prepared to help you check whether they can identify the cause of this behavior.

1> Reconnect the Work or School account in Windows

Go to: "Settings" > "Accounts" > "Access work or school"

If the account shows any warning, error, or"Sign in again" message:

Select the account->Disconnect it-> Restart the PC.
Reconnect the work/school account.
Try signing in to Teams again.

User's image

2> Clear cached Microsoft credentials

Open: "Control Panel" > "Credential Manager" > "Windows Credentials"
Remove entries related to: Office: Teams/ OneDrive/ AzureAD/ ADAL/ MicrosoftOffice.

Then:

Restart the PC.
Launch Teams or another Microsoft 365 app and sign in again.

User's image

Note: You may need to sign back into Microsoft applications after removing the cached credentials.

I hope I've been able to help in some way. Please keep me posted

Kind regards,

Jawad Almubarak 5 Reputation points

2026-09-02T14:40:27.5366667+00:00

No this is the first time this is happening, when it happened in teams it started happening in other 365 apps after I signed out of them. And its is provided by my school/organization.
Jawad Almubarak 5 Reputation points

2026-09-02T14:41:41.85+00:00

@Alina Le
Jawad Almubarak 5 Reputation points

2026-09-02T16:24:27.2866667+00:00

@Alina Le I kindly wait for your reply, please do as soon as possible because I want to solve the problem.
Alina Le 4,920 Reputation points Independent Advisor

2026-09-03T00:23:31.55+00:00

Hi,

Based on the information you have provided, the above steps are recommended for your reference. Please try them, including Step 3 below, and let me know the results so that I can continue troubleshooting the issue with you.

3/ Check VPN, Proxy, and Network Security Settings

Since the error occurs while connecting to Microsoft's sign-in service, Windows may be using an incorrect or outdated network routing setting (proxy). To rule this out, please try:

netsh winhttp reset proxy

Then restart the device and test the sign-in again. This simply removes any proxy configuration and restores a direct connection to Microsoft services.

In addition, if you are using a VPN, web filtering, antivirus, or other network security software, please temporarily disable it and test the sign-in again.

As the error specifically references login.microsoftonline.com, we would like to rule out any network-related configuration that may be preventing the Windows sign-in component from reaching Microsoft's authentication service.
Jawad Almubarak 5 Reputation points

2026-09-03T14:21:09.35+00:00

Hello, @Alina Le

I tried signing in with another persons account and the same issue remains so it is only on my laptop, as when I tried signing in with another device, it loaded instantly. I do use Norton for anti virus by the way. I tried the proxy command and it did not work.
Alina Le 4,920 Reputation points Independent Advisor

2026-09-03T16:36:55.61+00:00
Hi,

Thank you for the update.

Based on the information provided, the issue appears to be isolated to the affected laptop, as the same behavior occurs with multiple accounts on that device while the account works normally on another device.

Please make sure that the previous troubleshooting steps have already been completed:

1/ Reconnect the Work or School account in Windows.

2/ Clear cached Microsoft credentials.

If those steps have already been completed, please try the following to refresh the local authentication components used by Microsoft 365 applications:

3/ Reset the Azure AD Broker Plugin

Close Teams and all Microsoft 365 applications.

Press Windows + R, enter the following path, and press Enter: %LOCALAPPDATA%\Packages

Locate the following folder: Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy

Rename it to: Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy.old

Restart the device.

4/ Test the sign-in again

Open Teams or another Microsoft 365 application.

Try signing in with the work or school account.

*Since Norton antivirus is installed on the device, you can try to temporarily disable Norton Firewall and Web Protection during the sign-in attempt to rule out any interference with the authentication process.

Please let me know the outcome after completing these steps, including any error messages that may appear.

Thank you.
Jawad Almubarak 5 Reputation points

2026-09-05T16:26:09.89+00:00

@Alina Le I kindly wait for your reply, please do as soon as possible because I want to solve the problem. By the way, I tried uninstalling and reinstalling teams, and the login problem still remains (only for the school/organization account, personal accounts work just fine).
Jawad Almubarak 5 Reputation points

2026-09-06T14:19:13.3166667+00:00

Hi @Alina Le

You don't need to tire yourself as the problem has been solved and everything has gone back to normal. I didn't identify the problem but everything started to work again so didn't bother to look deeper, thank you for your feedback and updates.

Best Regards.
Alina Le 4,920 Reputation points Independent Advisor

2026-09-07T08:58:18.91+00:00

Hi,

I am so happy to hear that news.

You can save this thread so that you can refer to these troubleshooting steps in the future if the issue comes back.

If you need help with any issues related to Microsoft 365 apps, you can reach out to this forum again for helpful advice.

Have a great week ahead!
Stefan Blom 350.8K Reputation points MVP Volunteer Moderator

2026-09-07T10:14:21.2433333+00:00

I didn't identify the problem but everything started to work again [---]

So Teams access just started working? Maybe it was just a temporary glitch.

Or did you need to ask for assistance from your local IT support (network admin)?