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Why am I getting 4001 or 400-1 errors messages in apps?

I'm new to uverse and opened the uverse app yesterday and after sign-on periodically, and sometimes sequentially, got an error 4001. I'm able to watch live TV now, but I'm having problems with the ABC app giving me the same error message after sign on to verify I have ATT uverse. The error says to c

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ABC error 400-1

I am signed in on ABC with u-verse to watch shows on my Macbook Air. It has been working until yesterday when I got an error code (400-1) saying that a playback error had occured. It is like this for all of the shows. What can I do?

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