Although I'm not technically a 8x8 customer, I do use 8x8 Video Meetings which is powered by Jitsi Meet. 8x8 Video Meetings seems to be a completely free and separate product from the rest of 8x8's conferencing solutions and does not require any sort of existing or new 8x8 subscription to use. From what I can tell, it just seems to be a Jitsi Meet instance running on 8x8 infrastructure with 8x8 branding tied in. See here: https://www.8x8.com/products/video-conferencing