I am trying to update subscriber status in All Subscribers via the SOAP API for subscribers who have unsubscribed. Ultimately, I would like to be able to make a call that also adds a subscriber if they do not exist as a part of this, but right now I am simply trying to update a status. We use multiple SFMC API calls and I am familiar with the authorization process and all the rest. Everything I can find tells me this should work, but I get an 'API object not found' error. Have also tried this as a CreateRequest and with and without the <EmailAddress> parameter. Any help is appreciated.
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http//www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" >
<soap:Header>
<fueloauth>MYTOKEN</fueloauth>
</soap:Header>
<soap:Body>
<UpdateRequest xmlns="http://exacttarget.com/wsdl/partnerAPI">
<Objects xsi:type="Subscriber">
<SubscriberKey>MYKEY</SubscriberKey>
<Status>Unsubscribed</Status>
</Objects>
</UpdateRequest>
</soap:Body>
</soap:Envelope>
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