Chat toggle on jitsi API not working

have been trying to integrate jitSi APi and it works,
but the chat on web integration isn’t working,
using chat toggle it toggles the chat on screen but sending a message nothing is display on the screen

I will be greatfull

thanks sir for information, but i have some queries,

I am developing an online education system for my client, so clients have requirements of 50 + hosts can take live conferences at a time.
They have 5000 students and want to manage with live conferences at a time with parallel hosts.
So please help me sir, is jitsi suitable for that? if it is suitable, please send me pricing details, and limit of conference.

Yes jitsi can run that for, and I can handle for you as well

I will appreciate if anyone can help me on this?