Considering what you posted at " Error Code="Account Password Invalid" (please don’t create more than one post, it is futile and spreads the conversation)
OnlineException DateThrownLocal=“2023-08-09T12:13:30.763” DateThrown=“2023-08-09T12:13:30.763Z” ErrorCode=“AccountPasswordInvalid” Type=“13” Category=“4” Severity=“1” TypeString=“InvalidPassword” CategoryString=“Validation” SeverityString=“Minor” HostName=“” HostIP=“” Id=“{01b68373-c594-4bdc-8aa6-16dbdbe7e1cc}” Message=“Publisher account password failed” FullText=“com.dexcom.udp.common.data.exception.OnlineException: Publisher account password failed” />',
I think your Dexcom user and password are invalid, try updating them as explained in this guide Nightscout in Fly.io — Nightscout Documentation documentation