Clipboard helper connection rejected: untrusted-signature in event viewer, mwb clipboard dead on powertoys 0.103.3012.0

Feb 12, 2025
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mouse without borders clipboard sharing just goes quiet on the powertoys 0.103.3012.0 insider build. nothing gets written to the MWB logs folder, the only trace is in event viewer under windows logs, application, source MouseWithoutBordersHelper:

Clipboard helper connection rejected: untrusted-signature

in that build PowerToys.MouseWithoutBordersHelper.exe carries a different microsoft cert thumbprint than PowerToys.exe and the other mwb exes, so the helper pipe refuses it. Get-AuthenticodeSignature still says Valid on all of them.

same kind of break as the older settingssync rejection, just the clipboard pipe now