The staple and validate action failed! Error 68.

I was trying to follow the steps of signing my library -> submit it for notarization -> staple it. The first two stages show no error but I had some issues with the final stage of stapling. For example, if I want to staple one of my dynamic libraries, as following,

xcrun stapler staple --verbose libs/libX11.6.dylib

I got the following error,

Processing: /Applications/RMCProfile/libs/libX11.6.dylib
Properties are {
    NSURLIsDirectoryKey = 0;
    NSURLIsPackageKey = 0;
    NSURLIsSymbolicLinkKey = 0;
    NSURLLocalizedTypeDescriptionKey = "Unix Executable File";
    NSURLTypeIdentifierKey = "com.apple.mach-o-dylib";
    "_NSURLIsApplicationKey" = 0;
}
Props are {
    cdhash = {length = 20, bytes = 0xbd1e9c1fcae2663f3bb56af9f789557164badd00};
    digestAlgorithm = 2;
    flags = 65536;
    secureTimestamp = "2021-04-25 22:37:07 +0000";
    signingId = "org.xquartz.libX11.6.dylib";
    teamId = NA574AWV7E;
}
JSON Data is {
    records =     (
                {
            recordName = "2/2/bd1e9c1fcae2663f3bb56af9f789557164badd00";
        }
    );
}
 Headers: {
    "Content-Type" = "application/json";
}
Domain is api.apple-cloudkit.com
Certificate trust evaluation did not return expected result. (5)  [leaf AnchorApple IntermediateMarkerOid LeafMarkersProdAndQA]
Certificate trust evaluation for api.apple-cloudkit.com did not return expected result. Certificate authority pinning mismatch.
Certificate trust evaluation did not return expected result. (5)  [leaf AnchorApple IntermediateMarkerOid LeafMarkersProdAndQA]
Certificate trust evaluation for api.apple-cloudkit.com did not return expected result. Certificate authority pinning mismatch.
Could not establish secure connection to api.apple-cloudkit.com
Response is (null)
error is Error Domain=NSURLErrorDomain Code=-999 "cancelled" UserInfo={NSErrorFailingURLStringKey=https://api.apple-cloudkit.com/database/1/com.apple.gk.ticket-delivery/production/public/records/lookup, NSErrorFailingURLKey=https://api.apple-cloudkit.com/database/1/com.apple.gk.ticket-delivery/production/public/records/lookup, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "LocalDataTask <753649B9-EBC8-42CE-B0DD-0862A2B0D62B>.<1>"
), _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <753649B9-EBC8-42CE-B0DD-0862A2B0D62B>.<1>, NSLocalizedDescription=cancelled}
Size of data is 0
CloudKit's response is inconsistent with expections: (null)
The staple and validate action failed! Error 68.

Can anyone share some thoughts about this? Thank you!