Citrix Workspace: SSL Error 61: You have not chosen to trust XYZ certificate

Try the following fix in an elevated powershell session:

# create temp dir for certs
new-item -path C:\temp\certs -itemtype directory

# download latest SST from Microsoft
CertUtil –generateSSTFromWU C:\temp\certs\RootStore.sst

# Import RootStore.sst to Trusted Root CA Store
$file = Get-ChildItem -Path C:\temp\certs\Rootstore.sst
$file | Import-Certificate -CertStoreLocation Cert:\LocalMachine\Root\

There shouldn't need to be any reboot with this fix.