What does HRESULT 0x80244024 (WU_E_PT_HTTP_STATUS_VERSION_NOT_SUP) mean?

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WU_E_PT_HTTP_STATUS_VERSION_NOT_SUP same as HTTP status 505 - the server does not support the HTTP protocol version used for the request.

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WU_E_PT_HTTP_STATUS_VERSION_NOT_SUP

WU_E_PT_HTTP_STATUS_VERSION_NOT_SUP maps to HTTP 505. A server or intermediary rejected the HTTP protocol version used for the request.

Check reverse proxies, TLS inspection devices, and load balancers between the client and WSUS for protocol translation or restrictive HTTP settings.
Verify that the configured endpoint is the intended WSUS service rather than a generic web endpoint.
Use server-side IIS and proxy logs to identify which component generated the 505 response.