Hi @Anonymous,
Do you want to connect to Trello connector within your flow?
Currently, Flow use a Basic Authentication to connect to Trello connector. If you want to connect to Trello connector within Microsoft Flow, please take a try with the following steps:
- Sign up a Trello account in Trello web portal.
- Create a flow on your side, within the flow, add a Trello trigger or action. If you connect to Trello connector first time, this connector would ask you to sign in:
- Click "Sign in" button, within the pop-up window, type your username and password that you Sign up at Step1, then click "Log in":
- The pop-up window would prompt you that, you need to assign access permission to Microsoft Flow. Please click "Allow" button.
- Then you have made a connection to the Trello connector within your flow.
Maybe you want to add a new connection to the Trello connector within your flow, please take a try to click "Menu" button within the Trello trigger or action, then click "Add a new connection" button:
More details about adding a connection within Microsoft Flow, please check the following article:
Add a connection within Microsoft Flow
Best regards,
Kris