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.
Community moderators have prevented the ability to post new answers.
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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