chat SDK init() fails 404 not found

starting yesterday afternoon, my chat client stopped working. I'm using sdk 0.1.53 (directly, not via the sample widget). the logs show:

AvayaCCaaSChatSDK.init() called (integrationId = fbea297d-dedf-4071-9f94-0a8315b6264e, reconnectionTimeout = 120, idleTimeout = 300, idleShutdownGraceTimeout = 30, logLevel = DEBUG)

Using sessionId from Session Storage (sessionId = "ebfc6024-463b-499d-9a40-9f897114cc05", )

GET https://na.cc.avayacloud.com/sdk/digital/chat/v1/integrations/fbea297d-dedf-4071-9f94-0a8315b6264e/sessions/ebfc6024-463b-499d-9a40-9f897114cc05 404 (Not Found)

I have checked my integrationId and it's correctly administered, so I'd guess it's that sessionId (obtained from "Session Storage" that's not being found.

how do i fix that?

coincidentally the problem started yesterday afternoon as the latest drop rolled out.

	AvayaCCaaSChatSDK.init( {
			hostURL: baseURL,
			integrationId: libertyDemoChatIntegration,
			token: tokenJWT,
			appkey: myAppKey
		}, {
			reconnectionTimeout: 120,
			idleTimeout: 300,
			idleShutdownGraceTimeout: 30,
			logLevel: "DEBUG"
		}
	);