Is it possible for Subtitle Edit to use Microsoft Azure voices for text-to-speech without requiring an API key, similar to how Balabolka works?

[doquan0]

I’m currently using Subtitle Edit v4.0.15 (and the v5.0.0-beta16) on Windows 10 64-bit. When going to the Video > Text to Speech feature, selecting the Microsoft Azure TTS (AzureSpeech) engine, testing this voice, the program prompts: "Please add API key".

However, I've noticed that another text-to-speech freeware - Balabolka v2.15.0.915, under Tools > Use online TTS service > Microsoft Azure, the API key appears to be optional. Even without providing one, it can still get voices and save audio files successfully.

So I’m wondering — is it possible for Subtitle Edit to use Microsoft Azure voices for text-to-speech without requiring an API key, similar to how Balabolka works?