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I'm new to working with the Availity coverages API endpoint and see that there's an error common to the first few calls I've made:

"errorMessage": "Please enter a valid Payer ID.",

I'm using PayerIds taken from a document shared by Availity, so for example Providence Health Plan is listed as having a Payer Id of 101039.  Does anyone know why I would get an error rejecting this value?  It's throwing this error for everything I've sent, including KSRCN, 040, CHPWA, which all appear as valid Payer Ids in the shared documentation.