Try a different browser.
If that doesn't work and you have access to another computer try it on the other computer.
Finally, you can also enable cross save using the Destiny 2 Companion App, give that a try if different browsers and computers don't work for you.
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Thank you, that worked! Specifically, I followed the following steps: - Using Firefox, - Navigated to bungie - Logged in using PSN first - Authenticated Steam - Had to authenticate xbox to enable next button - This time Steam characters showed up to select Everything went fine after that.