Twitter API error 215

Question

Today, we discovered one of my clients Twitter feeds became broken.

I have tried switching to using the new API 1.1, but get the following error:

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Answer 1

Your example doesn't state whether you are authenticating, so I will assume you are not.

All methods in API 1.1 require authentication via OAuth. https://developer.twitter.com/en/docs/basics/authentication/oauth-1-0a

Unauthenticated access is discontinued permanently.