Changing between multiple Microsoft Teams accounts within the app or browser
Dear @Marcus Chan,
Thank you for posting your question in the Microsoft Q&A forum.
Please understand that our forum is a public platform, and we will modify your question to cover your organization domain name in the description. Please notice to hide these personal or organization information next time you post error or some information to protect personal data.
Based on your description, you want to leave the organizations or channels on teams as guest but you can't find the option leave there.
Here are some steps you can refer to:
If you're using a personal account or email one-time passcode, you'll need to use a My Account URL that includes your tenant's name or tenant ID. For example:
https://myaccount.microsoft.com?tenantId=contoso.onmicrosoft.com
Click to Organization on the left pane > Organizations > click leave organization
You might need to open this URL in a private browser session
If you're using a work or school account, ask your IT/admin of your organization: go to https://myaccount.microsoft.com > "My Groups" from the My Apps drop-down menu > Organizations > Find the organization you want to leave > click Leave.
It might take time for this change to reflect in Teams.
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