How to disable the option "Only during the meeting" (formerly Without transcription) tenant-wide?

Testing on MS Teams calls has shown that the option "Only during the meeting" (which used to be called "Without transcription") results in some parties not being informed they are being "listened to" by M365 Copilot. These parties include anyone joining from a tenant that is different to the hosting tenant, those that dial in and any joiners from an iOS device. This is unethical so we'd like to turn off the "Only during the meeting" tenant-wide. How can we do this?