POST https://directline.botframework.com/v3/directline/conversations 403 (Forbidden)

I get this error since last week. Our bot worked fine and suddenly started giving us this error. Until last week we used https://directline.botframework.com/v3/directline/tokens/generate to generate a token. We then switched to https://europe.directline.botframework.com/v3/directline/tokens/generate because our resources (Azure Bot, Web App running the bot, WebApp running the web chat; all F0-tier) were created in West Europe last year but with no success.

The exact error is:

{
    "message": "ajax error 403",
    "xhr": {},
    "request": {
        "async": true,
        "crossDomain": false,
        "withCredentials": false,
        "headers": {
            "Accept": "application/json",
            "Content-Type": "application/json",
            "Authorization": "Bearer <Token>",
            "x-ms-bot-agent": "DirectLine/3.0 (directlinejs; WebChat/4.17.0 (Full) 0.15.5)",
            "X-Requested-With": "XMLHttpRequest"
        },
        "method": "POST",
        "responseType": "json",
        "timeout": 20000,
        "url": "https://directline.botframework.com/v3/directline/conversations",
        "body": "{\"user\":{}}"
    },
    "status": 403,
    "responseType": "json",
    "response": {
        "error": {
            "code": "RegionNotAllowed",
            "message": "The request received in france but target regional bot belongs to europe. Please check BaseURI  https://docs.microsoft.com/azure/bot-service/rest-api/bot-framework-rest-direct-line-3-0-api-reference?view=azure-bot-service-4.0#base-uri."
        }
    }
}

The error states that the request is received in france, but none of our resources were created in france. I already renewed the keys of the directline channel, which did not work.

Any help is appreciated.

レポートで参照されている Direct Line REST API のベース URI のドキュメントから始め、トークン生成エンドポイントを会話の POST エンドポイントおよびその RegionNotAllowed 応答と比較します。記載されている URL を使ってリクエストを再現し、どのリージョンのエンドポイントが受け入れられるかを確認します。完了の条件は、確認済みの原因と解決策を文書化すること、または問題がこのクライアントライブラリの外部にあると特定することです。