What's the oldest android version to support TTS?

I have an older Android phone (v7) and was able to get the Companion app (minimal) working.
Now I was trying to use this as a device to receive notifications from HA.
I tried both TTS and text but only the text works.
For TTS, the device shows a message:

Unable to process notification 'test' as text to speech.

Is this because of the Android version?
I have searched for information about it but couldn’t find any.