Every Trello user will have to authenticate their account from their end. General instructions on how to enable a Power-Up are available at https://help.trello.com/article/810-enabling-power-ups
A user will then be asked to authenticate once they want to attach a file or view an already linked file. You can find the OneDrive Power-Up overview at https://trello.com/power-ups/5940440775fbe327abd3329f
If you or any particular users run into trouble authorizing their account, feel free to get in touch at https://trello.com/contact
If you had to thrive a new habit during a lockdown, what would it be? Trello
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