We have shared devices (in this case an iPad) and the useres should be able to change the account that is currently logged in to the slack and trello apps to their own.
For example: Colleague A uses the ipad and logs in to Slack and Trello. Then colleague B wants to use Slack and Trello with their own account. We managed to change the user in Slack but it's not possible to choose another user when we want to log in to Trello using the Slack user.
How can I solve this problem?