Error 1200 - Something went wrong when signing in Microsoft Teams

Dear Huyen_Le,

Good day!

Thank you for posting to Microsoft Community. We are glad to assist!

Based on your description regarding "Error 1200 - Something went wrong when signing in Microsoft Teams". May I please know if you are using windows or Mac device? If you are using Windows device, kindly check with below methods to see if it will make any difference:

Note: Before performing this, kindly close all office Apps.

++ Kindly try to disconnect account from Work access or School:

1. Click On Windows Start Menu

2. Settings

3. Accounts

4. Work Access or School

5. Select the account and click on Disconnect

++ Kindly try to clear credentials

1. Open Control Panel > Credential Manager.

2. Select Windows Credentials

3. Remove all Windows credentials listed for Office16 by selecting the drop-down arrow and Remove. (remove credentials related to the account you want to sign into)

++ kindly try to remove the account from Registry key

1. On your keyboard press Windows Key +R(Or Click on Windows Start Menu and Search Run)

2. Type Regedit

3. Navigate to this path :HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity

4. Expand Identities folder

5. Select on each folder and check which folder shows the email address of the account you want to sign into

6. After locating the folder, please right click on it and delete

If the issue persists, would you mind offering below information:

• May I know your current environment? Is It Exchange Hybrid, on-premises exchange (Exchange server) or pure cloud?

• Would you mind to kindly provide the screenshot of the outlook version are you using? What version of Outlook do I have? - Microsoft Support

• Could you please provide entire screenshot of the error and pop-up message you're experiencing or your current situation? (Please hide information such as email for the privacy of your data)

Looking forward to your response.

Best regards,

Inema |Community Moderator

Hi Inema,

Many thanks for your advice. I am using Microsoft devices and my issue was sorted after following your suggestions.

Kindest regards

Huyen

Greetings Huyen_Le,

I hope you are doing well!

Many thanks for the prompt response. Glad to hear that this is resolved on your end. If you don't mind, could you kindly submit your feedback and vote. You could help any other community users who might be facing a similar scenario to easily find this thread/post. Feel free to post back to the forum if any issue comes up and we'll be glad to assist. Thank you for your time and have a great day.

Best Regards,

Inema

Hi Inema,

Sorry it's me again. I thought the issue was sorted but another one came up when I tried to sign in other Microsoft apps, including One Drive, Outlook, etc. I was able to fill in the password to sign in then a message popped up as the photo below.

I am still able to log in and use the apps if clicking "Done" but it signs me out after a while.

Note sure if anything I have done wrong here.

Thank you in advance.

Huyen

Cannot sign in to the desktop teams