MS Graph API: 500 UnknownError with "/communications/onlineMeetings" request

Question

1. Credentials as global administrator for tenants
2. Create a subscription for online meetings
3. Request error occurred

1. Credentials as global administrator for tenants

   // environment  
   // OAUTH_REDIRECT_URI=http://localhost:3000/delegated/callback  
   // OAUTH_SCOPES = 'https://graph.microsoft.com/OnlineMeetings.Read.All,https://graph.microsoft.com/OnlineMeetings.ReadWrite.All'  
       
   // /signin  
   const authUrl = `https://login.microsoftonline.com/common/adminconsent?client_id=${process.env.OAUTH_CLIENT_ID}&state=${MYAPP_STATE}&redirect_uri=${process.env.OAUTH_REDIRECT_URI}`;  
   https: res.redirect(authUrl);  
         
     
   // response    
   admin_consent: True  
   tenant: {OWN_TENANT_ID_HERE}  
   state: MYAPP_STATE  

2. Create a subscription for online meetings

   const client = graph.getGraphClientForApp(req.app.locals.msalClient);  
     
   const notificationHost = process.env.NGROK_PROXY;  
     
   const JoinWebUrl =  
     'https://teams.microsoft.com/l/meetup-join/19%3ameeting_YzI1YjI0ZWMtNTU4ZS00YWI1LTgwZGEtOWE1YTU3MzIyYTZl%40thread.v2/0?context=%7b%22Tid%22%3a%22c0890c45-a72b-48ff-8447-29d2135997f9%22%2c%22Oid%22%3a%22e0b27185-212f-40d1-8e41-87ac4cbdefd8%22%7d';  
     
   const resource = `/communications/onlineMeetings/?$filter=JoinWebUrl eq '${JoinWebUrl}'`;  
     
   const subscription = await client  
     .api('/subscriptions')  
     .version('beta')  
     .create({  
       changeType: 'updated',  
       notificationUrl: `${notificationHost}/listen`,  
       resource,  
       clientState: process.env.SUBSCRIPTION_CLIENT_STATE,  
       includeResourceData: false,  
       expirationDateTime: new Date(Date.now() + 3600).toISOString(),  
     });  

3. Request error occurred

   {  
     statusCode: 500,  
     code: 'UnknownError',  
     requestId: 'c170df43-786d-4059-99d4-59f4c1a65b5d',  
     date: 2022-09-05T21:51:23.000Z,  
     body: '{"code":"UnknownError","message":"DocumentDb subscription creation failed","innerError":{"date":"2022-09-06T06:51:23","request-id":"c170df43-786d-4059-99d4-59f4c1a65b5d","client-request-id":"44ea6d8f-8ff6-e1fb-af8b-417d88c1286c"}}'  
   }  

I can't find the next action.
Do you have any ideas?