Mattermost Desktop 5.4.0 for Windows / Proxy pop up

Hello,
I installed the desktop version 5.4 and it’s good so far. Now the system administrator gets a proxy pop-up window in the first time you switch to the system console.

How can I solve this problem?

I see this message in the main.log file:
[2023-07-19 11:14:01.853] [info] [AuthManager] Cancelling request for https://js.stripe.com/v3
[2023-07-19 11:16:07.118] [info] [ModalView] [proxy-proxy.prod…] preloading with C:\Program Files\Mattermost\Desktop\resources\app.asar\desktopAPI.js
[2023-07-19 11:16:23.020] [error] [AuthManager] Error processing login request {
request: {
url: ‘https://js.stripe.com/v3’,
isMainFrame: false,
firstAuthAttempt: true,
responseHeaders: {
‘content-length’: [ ‘2638’ ],
‘proxy-authenticate’: [ ‘Basic realm=“Internet Proxy”’ ],
‘proxy-connection’: [ ‘Keep-Alive’ ]
}
}
}
[2023-07-19 11:16:23.021] [info] [AuthManager] Cancelling request for https://js.stripe.com/v3

Thanks a lot for any help.
Roger