I created my first custom connector in PowerAutomate around 3 months ago. (This is to a email marketing service.) All worked (and continues to work fine.
I have a second account now with the provider and so I want to use the custom connector in a new flow and with a new connection. I have got the api key for the new account with the marketing service, I have added this as a connection, but it fails to authenticate.
I have tested it directly in a flow and in the custom connector builder.
Am I missing something?

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