There are few colleagues I added to my Trello board and it says ther accounts are deactivated. However, they confirm they can use trello and see other baords.
I am not sure what would cause this.
Have they verified their accounts?
You could try to remove them from the board and ask them to join by sharing a link with them...
https://support.atlassian.com/trello/docs/inviting-people-by-using-a-shareable-link/
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