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Then based on my understanding, you ran the Test-OutlookWebServices cmdlet in Exchange 2019 and got a failure result for Autodiscover service, right? If this is the case, you can just ignore the result as although this cmdlet can be run in Exchange 2019, it's functional only in Exchange Server 2010.
Reference: Test-OutlookWebServices
I tried runing it in my Exchange 2019 lab environment and got the same output as yours. But as mentioned above, the output doesn't make sense at all in Exchange 2019.
With the above being said, if you are attempting to check the autodiscover service within your environment, you can take advantage of the built-in Outlook client tool Test E-mail AutoConfiguration. For detailed instructions, you can refer to: Mailboxes - Test E-mail AutoConfiguration
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