In the same IVR flow, the TTS system successfully plays announcements from the cache but fails to play announcements from .txt files.
Run the following command to configure the TTS license:
SET TTSLIC: NN=0, LN=240, TTSLANGID=TTSLIC_TYPE0-1;
Set LN to the license quantity and set the other parameters based on the site requirements.
Only one TTS license is available. The TTS system occupies the license when playing announcements from the cache. As a result, no license is available for playing announcements from .txt files.