Hi Kialand. Appreciate you reporting your issue to us.
The BUFFALO error occurs when there is a connection issue with Battle.net's servers. You may want to review our BUFFALO help article for more information about this issue.
Are you opening Destiny 2 through Battle.net? That is required to play Destiny 2.
Here are a few steps that may help with your issue:
[quote][b]1.[/b] You may also want to try opening the battle.net launcher "Settings" and change the "When I open a game" option to "close the battle.net launcher completely" option.
[b]2.[/b] Some players have suggested disabling Internet Protocol Version 6 (TCP/IPv6) on the PC might help with this issue.
[b]3.[/b] You may want to change your region/server to another location.
[b]4.[/b] Some players have suggested disabling the "Always require authenticator for login" option in your Blizzard account settings.
[b]5.[/b] Some players have reported that disabling IPV6 has helped them with this issue.[/quote]
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Connecting to the EU Server then back to the American Server has solved my issue. Thank you so very much!