Why some Office 365 E3 users has 50 GB spaces?

Situation: The client uses Office 365. They find some E3 user have only 50 GB (it should be 100 GB for Microsoft new policy).

Troubleshooting: We find most old users have only 50 GB spaces. New users have 100 GB spaces. Here are some resolutions:

1. Re-assign the # license to old users.
2. Switch Admin center to the new admin center and switch backup.
3. Go to E3 settings, turn off and then turn on Exchange Plan2.
4. Call Microsoft support to run PwerShell to force the update. Here are the example PowerShell commnads:

3:16 PM Mark: Set-ExecutionPolicy RemoteSigned
3:16 PM Mark: $UserCredential = Get-Credential
3:17 PM Mark: $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
3:18 PM Mark: Import-PSSession $Session -DisableNameChecking
3:18 PM Mark: Get-Mailbox | Set-Mailbox -IssueWarningQuota 98GB -ProhibitSendQuota 99GB -ProhibitSendReceiveQuota 100GB