If you have your Twitch account linked to your Bungie profile, please unlink it, and the Tapir error should resolve itself. Until a proper fix is in place, you will need to leave your Twitch account unlinked, whenever you wish to access Destiny 1.
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Thanks for the reply but no my account isn't linked with Twitch.
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You most definitely do have a Twitch account linked to your Bungie profile. In a browser session (not the app), login to your Bungie profile, click on your profile icon in the top right, Settings, Accounts & Linking. Scroll down to where your Twitch account is listed, and click the unlink button. Leave the account unlinked whenever you want to access Destiny 1.