Same here....from the log...
019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> WebServices.WebContent: Request actions, CallerId updaterType
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> WebServices.ServiceResponse: Making request to https://officeci-mauservice.azurewebsites.net/MAUService/api//Actions for CallerId [updaterType]
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> UXRefresh: DashboardRowView: updateState: Downloading
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> UXRefresh: DashboardRowView: tintAppUpdateStatusIcon: Install Date Available.
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> UXRefresh: DashboardRowUpdateView: updateState: Downloading.
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> UXRefresh: DashboardViewController: SetState: State = Updating.
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> WebServices.ServiceResponse: Response time: 59.893012, callerID: updaterType, api: /Actions
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> WebServices.WebContent: Action received for updaterType
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> WebServices.DeltaUpdater: UpdaterType - Cannot use Binary Delta as Install On Clone is not applicable
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> WebServices.DeltaUpdater: UpdaterType - actionId string: UseBinaryDelta, Updater type 1
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> DownloadTask.DownloadBegin: ID: 2BA10F94-D706-4E6F-AF15-9A903E946EA4, PreviousID: , AppID: MSau04, Version: 4.17.19102802, UpdateVersion: 4.17.19110502, Pkg: Microsoft_AutoUpdate_4.17.19110502_Updater.pkg
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> DownloadManifest.Downloading: Downloading. URL: https://officecdn-microsoft-com.akamaized.net/pr/4B2D7701-0A4F-49C8-B4CB-0C2D4043F51F/MacAutoupdate/Microsoft\_AutoUpdate\_4.17.19110502\_Updater.pkg
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Debug> DownloadManifest.Status: Attempting dowload. URL: https://officecdn-microsoft-com.akamaized.net/pr/4B2D7701-0A4F-49C8-B4CB-0C2D4043F51F/MacAutoupdate/Microsoft\_AutoUpdate\_4.17.19110502\_Updater.pkg
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Debug> DownloadActor.Status: Fetching file Attempt. URL: https://officecdn-microsoft-com.akamaized.net/pr/4B2D7701-0A4F-49C8-B4CB-0C2D4043F51F/MacAutoupdate/Microsoft\_AutoUpdate\_4.17.19110502\_Updater.pkg
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> DownloadActor.Status: Fetching file Success. File: https://officecdn-microsoft-com.akamaized.net/pr/4B2D7701-0A4F-49C8-B4CB-0C2D4043F51F/MacAutoupdate/Microsoft\_AutoUpdate\_4.17.19110502\_Updater.pkg
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Debug> DownloadManifest.Status: Dowload Attempt successful. Downloaded Temp Location: file:///var/folders/4j/00lh1f5j0r9c4qj_fxgc88z4k402f0/T/MSau_39495/Microsoft_AutoUpdate_4.17.19110502_Updater.pkg
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Error> DownloadManifest.SignatureError: Signature cannot be verified. File: Microsoft_AutoUpdate_4.17.19110502_Updater.pkg
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Info> DownloadManifest.DownloadFail: Failed to download https://officecdn-microsoft-com.akamaized.net/pr/4B2D7701-0A4F-49C8-B4CB-0C2D4043F51F/MacAutoupdate/Microsoft\_AutoUpdate\_4.17.19110502\_Updater.pkg because
'Error Domain=com.microsoft.autoupdate Code=500 "Failed to verify file signature" UserInfo={NSLocalizedDescription=Failed to verify file signature, NSLocalizedFailureReason=Either it is a mismatch of key or hash is incorrect}'
2019-11-07 07:45:17 [Microsoft AutoUpdate] <Error> DownloadTask.DownloadFailure: ID: 2BA10F94-D706-4E6F-AF15-9A903E946EA4, Details: {
DownloadURL = "officecdn-microsoft-com.akamaized.net/pr/4B2D7701-0A4F-49C8-B4CB-0C2D4043F51F/MacAutoupdate/Microsoft_AutoUpdate_4.17.19110502_Updater.pkg";
ErrorCode = 500;
ErrorDomain = "com.microsoft.autoupdate";
}