http result: 500 sendresourcerequest() failed. 801901f4 download() failed. 801901f4 in smsts.log

[mason5555]

Hello - My TS is getting hung and I am repededly getting the following 3 lines in the smsts.log again and again
http result: 500
sendresourcerequest() failed. 801901f4
download() failed. 801901f4
I don't have any errors in the applydriverpackage.log and the last line entered there is:
Starting package download content download process (WinPE), this might take some time.
Command line arguments I am using are:
-BareMetal -Endpoint 'server.domain.com' -TargetOSName 'Windows 10' -TargetOSVersion '20H2'
I can add larger snippets from either log if necessary.
So far I have added the admin service svc account to the list of network access accounts, and examined the IIS logs and couldn't find anything out of the ordinary there. I saw another post mentioning checking the "allow clients to connect anonymously" checkbox on the DP but have not tried it yet. Any help is appreciated.

[mason5555]

A little further up in the applydriverpackage log in yellow text i see the following:
The remote AdminService endpoint certificate is invalid according to the validation procedure. Error message: The underlying connection was closed. Could not establish trust relationship for the SSL/TLS secure channel.
Will attempt the set the current session to ignore self-signed certificates and retry AdminService endpoint connection.
The log then appears to continue on without issue