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Uncheck the option "Prevent cross-site tracking"

Restart the browser and try logging in again.

Note: Safari 13.1 contains an update that may cause issues with downloading files, chat alerts, and displaying images in Canvas. Canvas engineers are currently working on a solution for this issue. Until then, you can avoid errors with files and images by
disabling cross-site tracking prevention in Safari when using Canvas."

If this does not resolve the issue you can try another browser(ie: Google Chrome) to see if the problem persist in other browsers.