You connect your Google Workspace account with SyncSignature that will allow you to sync your users from Google Workspace.
You will be able to add all domains, domain aliases and users with their aliases on SyncSignature.
You can then organise them into Groups and install signatures for users and their aliases.
While installing signatures for aliases, you will have to ensure configuration for SMTP.
Follow the steps shown below:
This will ensure that the signatures are setup and installed corrected for domain and user aliases.
If you still have trouble with it, please connect with us at support@syncsignature.com and we will get back to you.