Do you see any issues enabling other Power-Ups? I'd see if the issue is maybe browser related. We do have a few troubleshooting steps here: https://help.trello.com/article/736-troubleshooting-browser-issues-with-trello
If that does not help, feel free to reach out to our support team with the error console of the browser.
If you had to thrive a new habit during a lockdown, what would it be? Trello
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