In Slack and Outlook I can be active with multiple accounts at the same time. How can I do that in the Teams app? As a consultant I have an O365 account for our own tenant, but also other accounts in my customers’ tenants and my own dev tenant. I need to be up to date in all my channels in all tenants. If this isn’t possible, Teams is anything but a “Slack killer”.
Unfortunately this is not possible at this time. However, you can voice your opinion on the UserVoice!
https://microsoftteams.uservoice.com/forums/555103-public-preview/suggestions/16925362-sign-in-to-client-with-multiple-accounts