Facing issue in SDK authorization getting error MobileRTCAuthError.keyOrSecretWrong

We are using a key/secret for Authentication.
Getting MobileRTCAuthError.keyOrSecretWrong on meeting SDK authorization in both IOS and Android.
We tried all the solutions like integrating the old SDK and regenerating the secret key. In sample project with sdk also used same key but getting same error. We double check KEY and SECRET .

Which iOS Meeting SDK version?
5.11.2 (3958)

To Reproduce(If applicable)
Steps to reproduce the behavior:
let sdkInitialized = MobileRTC.shared().initialize(initContext)
and getting true.
During sdk Authentication using

let kSDKAppKey = “Ul*zu"
let kSDKAppSecret = "Fl
let initContext = MobileRTCSDKInitContext()
initContext.domain = “https://zoom.us”
initContext.enableLog = true
if MobileRTC.shared().initialize(initContext) {
if let authService = MobileRTC.shared().getAuthService() {
aauthService?.clientKey = kSDKAppKey
authService?.clientSecret = kSDKAppSecret
authService.delegate = authDelegate

We are getting error code MobileRTCAuthError(rawValue: 2)
That is SDK Key/Secret is not valid.

If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):
All device
ios 12 or above

Additional context
Add any other context about the problem here.

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