Looking for logging into the Trello Multiple site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Trello Multiple site. After that you can login as usual with your login credentials.
https://community.atlassian.com/t5/Trello-questions/quot-Toggle-quot-between-two-separate-Trello-accounts/qaq-p/578729
https://help.trello.com/article/739-merging-multiple-trello-accounts
https://help.trello.com/article/717-adding-people-to-a-board
https://trello.com/c/dUtbLJux/290-support-for-multiple-accounts
https://trello.com/b/hZigpsjL/multiple-login
https://blog.trello.com/using-multiple-boards-for-a-super-flexible-workflow
https://help.trello.com/article/1123-multi-board-guests
https://help.trello.com/article/927-what-are-teams
https://webapps.stackexchange.com/questions/78358/can-i-sign-into-two-different-trello-accounts-at-the-same-time
https://www.reddit.com/r/trello/comments/5t89nm/is_there_a_way_to_switch_between_workpersonal/
https://github.com/org-trello/org-trello/issues/308