About this question
We have stumbled upon The object "VoiceCall" can't be updated through a flow. error when introducing the required metadata for our Service Cloud Voice with BYOT (Bring Your Own Telephony - Amazon). For our CI builds we have added the permission set to the user in the Scratch org as instructed here.
The issue now comes when we try to create a package version. We're getting exactly the same issue and we can't seem to add anything so we can push our flow. We have already explored adding "apexTestAccess" to our sfdx-project.json file, as documented here. How can we add the relevant permission (ContactCenterAdminExternalTelephony) when building the package version?
