Not all members receive email sent to the group

1. Only members that have configured "FollowInInbox" will receive emails sent to the group in their Inbox.
   
   To check the "FollowInInbox" status of members, run the following command on EXO PowerShell:
   
   Get-UnifiedGroup <GroupName> | Get-UnifiedGroupLinks -LinkType Subscribers
   
   
2. Then, run the following EXO PowerShell command, if you want to configure all group members to receive emails sent to Microsoft 365 group in their Inbox:
   
   $Group = "Address of [Microsoft 365 Groups]"Get-UnifiedGroupLinks $Group -LinkType Member | % {Add-UnifiedGroupLinks -Identity $Group -LinkType subscriber -Links $_.Guid.toString() -Confirm:$false}
   
   In the following example, all members of group named TestG will be configured to receive emails sent to group in the Inbox
   
   $Group = "[e-mail]
   "Get-UnifiedGroupLinks $Group -LinkType Member | % {Add-UnifiedGroupLinks -Identity $Group -LinkType subscriber -Links $_.Guid.toString() -Confirm:$false}