Unable create Team's Channel with email address - microsoft-graph-api

Question

I am trying to create Channel of Team with email address (for example, General - Test Team 72 <527ce911.YYY.XX#emea.teams.ms>). I can create Channel but without email address.
I have tried following using Graph API (Powershell):
1. Graph API v1.0 and beta
2. Create Team (public, private with email) with default (General) Channel
3. Create additional Channels for existing Team
4. Create O365 group and from group create Team
5. Add members and owners to Team
6. Update/change settings of Team and channel
7. Create Channel's folder in the document library of SharePoint site linked to Team
function create-team($TeamName, $Visibility, $UserId){
$ApiUrl = "https://graph.microsoft.com/beta/teams"
$Method = "Post"
$MailNickname = $TeamName -replace '\s',''
$Body = #{
"template#odata.bind" = "https://graph.microsoft.com/beta/teamsTemplates('standard')";
"displayName" = "$TeamName";
"description" = "$TeamName";
"owners#odata.bind" = #("https://graph.microsoft.com/beta/users('$UserId')");
"Visibility" = "$Visibility";
"mailNickname" = "$MailNickname"
}
$BodyJSON = ConvertTo-Json $Body
$ContentType = "application/json"
#$AccessToken is not shown here
return Invoke-RestMethod -Headers #{Authorization = "Bearer $AccessToken"} -Uri $ApiUrl -Method $Method -Body $BodyJSON -ContentType $ContentType
}
function create-channel($TeamId, $DisplayName, $Description){
$ApiUrl = "https://graph.microsoft.com/beta/teams/$TeamId/channels"
$Method = "Post"
$Body = #{
"displayName" = "$DisplayName";
"description" = "$Description";
#"channelState" = "Active";
"groupId" = "$TeamId"
}
$BodyJSON = ConvertTo-Json $Body
$ContentType = "application/json"
#$AccessToken is not shown here
return Invoke-RestMethod -Headers #{Authorization = "Bearer $AccessToken"} -Uri $ApiUrl -Method $Method -Body $BodyJSON -ContentType $ContentType
}
I can not create a Channel using Graph API (Powershell) of Microsoft Team with email address. I can create Team with default Channel (General) or/and add additional Channels but they all do not have email addresses. When I choose " ... -> Get email Address" of the Channel in the web page I get following message infinitely (couple days):
We're still setting up your team.
Please try again later.
In the document library (Documents) of the SharePoint linked site I do not see a folder General if we talking about General Channel. But after I click to attach a document to Channel in the Conversations tab I get following message:
We're setting up your files.
Check back in a few minutes.
and after several seconds arrise email address in the Channel and folder General in the SharePoint site.
Is it possible to create Channel using GraphAPI with email?