Strange error of " Signature is invalid"

[j.schoenemeyer (Jürgen)]

you should first try, if your client id and client secret is working

Invalid Signature error after changing account email

first synch your computer/server with a global time server then you should check if your Meeting SDK app on Zoom App Marketplace works flawless use to test the Zoom Meeting SDK web sample on github (-> CDN version) the CDN version is ready to use in a few simple steps CDN/js/index.js:20 var CLIENT_ID = "YOUR_CLIENT_ID_OR_SDK_KEY";; CDN/js/index.js:26 var CLIENT_SECRET = "YOUR_CLIENT_SECRET_OR_SDK_SECRET; CDN/js/index.js:112 ... "/meeting.html?" // replace '/' with './'

you should try connect with role = 0 (attendee) and with role = 1 (host)

and here more infos for troubleshooting signature

Troubleshooting Zoom Meeting SDK signature validation