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Guest services external guest authentication - Invalid session ID

I have been trying to use guest service external authentication on a TZ470 running sonic OS 7, however when the POST is done to the mgmtBaseUrl with its additional parameters e.g. but no matter what I do it keeps giving me the 253 invalid session ID error in the xml response:

<?xml version="1.0" encoding="UTF-8"?>
<SonicWALLAccessGatewayParam xmlns:xsi="" xsi:noNamespaceSchemaLocation="">
		<ReplyMessage>Invalid session ID</ReplyMessage>

I've seen mention of the session ID query parameter using a different name so as well as sessId I have tried sessionId, sessionID etc. but this has no effect.

Is there something I am missing as to why it keeps reporting this error?

Category: Mid Range Firewalls
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