Authentication errors when sending messages to Teams

Question

Authentication errors when sending messages to Teams

Keita Yamashiro 61

The API is used in the following process.

get token
send a message to Teams using the obtained token

However, after you change the password of your Microsoft account, you will not be able to send messages to Teams.
You can get a token or update it with a refresh token.

The following APIs will generate error Unauthorized.

https://graph.microsoft.com/v1.0/teams/{team_id}/channels/{channel_id}/messages

If I change the password of my Microsoft account, will I not be able to use the Teams API?
I would appreciate it if someone could tell me.

Sharon Zhao-MSFT 25,761 Reputation points Microsoft External Staff

2021-09-29T01:37:59.7+00:00

@Keita Yamashiro ,
As we are mainly responsible for general question of Microsoft Teams, your question related to API is not in our scope. I will change office-teams-windows-itpro tag to office-teams-app-dev tag. Hope you get better response.

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Sharon Zhao-MSFT 25,761 Reputation points Microsoft External Staff

2021-09-29T01:37:59.7+00:00

@Keita Yamashiro ,
As we are mainly responsible for general question of Microsoft Teams, your question related to API is not in our scope. I will change office-teams-windows-itpro tag to office-teams-app-dev tag. Hope you get better response.

Answer 1

Ramjot Singh 861 Microsoft Employee

We are tracking an issue where changing password can result into it taking a long time to get access to the API again (upto 1 day). For now if you wait for a day you should get access to the API again.

Keita Yamashiro 61 Reputation points

2021-09-29T04:49:08.517+00:00

Thank you for your answer.

I see that if I wait up to 24 hours, it will be available.
This makes sense, because when I tested it myself, I found that sometimes it took only an hour before I could use it, and other times it took 24 hours before I could use it.
Hunaid Hanfee-MSFT 981 Reputation points

2021-09-29T12:26:37.5+00:00

If the response is helpful, please click "Accept Answer" and upvote it. You can share your feedback via Microsoft Teams Developer Feedback link. Click here to escalate.

Answer 2

Vasil Michev 119.9K MVP Volunteer Moderator

Microsoft (personal) accounts are not supported for that endpoint, as documented here: https://learn.microsoft.com/en-us/graph/api/channel-post-messages?view=graph-rest-1.0&tabs=http
You need to use a work/Office 365 account. Other than that, make sure you have the required permissions.

Keita Yamashiro 61 Reputation points

2021-09-28T09:47:42.937+00:00

Thank you for your answer.

I made a mistake, I am trying with Office365, not Microsoft account. So before I changed the password, I can send messages to Teams without any problem.
After changing the password, I can't send any more.
Vasil Michev 119.9K Reputation points MVP Volunteer Moderator

2021-09-28T13:15:45.04+00:00

Have you cleared your token cache after the password change?
Keita Yamashiro 61 Reputation points

2021-09-29T04:45:36.477+00:00

Thanks for the reply.

I have not cleared the cache of the token.
After changing the password, the token is retrieved again using the following API.

/oauth2/v2.0/token

If I am using the API, how do I delete the token cache?

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Authentication errors when sending messages to Teams

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