'Signature is invalid.', with meeting number created by other accounts

[j.schoenemeyer (Jürgen)]

try to modify the iat in the signature (default = 30 sec, change it some minutes)

Invalid signature after migrating to SDK JWT (v2.9.7)

In your code, for iat you subtract 30 seconds. In my case it’s 420. For exp, I add a bit more than 2h. You can multiple by 4 instead of 2 just for testing. Here is the working PHP code for generating signature: use Nowakowskir\JWT\JWT; use Nowakowskir\JWT\TokenDecoded; //... $iat = time() - 420; $tokenDecoded = new TokenDecoded([ 'sdkKey' => '<your sdk key>', 'mn' => '<your meeting number>', 'role' => 0, // or 1 depending on your needs 'iat' => $iat, 'exp' => $iat + …