POST registered email address filing

I am trying to Create a registered email address filing, but i’m getting a 500 Internal Server Error, please can someone help me with this?

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I’ve actually been experiencing the same issue. I’m not sure if this endpoint will only be supported once the Economic Crime Act 2023 goes into effect on March 4th. It would be good to know if this is indeed the case.

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This is a REST Api related service, not an XML one:

You will need to post your query to:
Companies House Developer Forum (


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