Hey @manoj.sarode,
The signature lasts 24 hours from creation date (in your servers timezone, which is most likely UTC/GMT).
I believe what’s happening is on the Zoom JS SDK, it is comparing the generated signature to your browsers timezone which could be different then UTC / GMT, thus the signature expiring for some users in different timezones.
I am working on getting more details for you and also updating our SDK documentation soon to make this more clear.
Let me know if this helps,
-Tommy