I've been battling a problem for the last several months and would appreciate any help or suggestions.
Issue: when we share any file/folder from a sharepoint site with a group (distribution group, security group, office 365 group, mail-enabled security group, AD Group) none of the members of the group receiving the email notifications. I've tried every possible group and i also made sure I checked the box to send the email when i shared the folder/file.
Environment: Microsoft 365, with Sharepoint/One Drive online, Azure AD. Our Exchange Server is On-premise, so is our AD, we synch with Azure AD using AD Connect.
What I've tried: I tried all the possible groups that i could create, thinking that it's probably a limitation of the group, but non worked. I tried different SP sites, same issue. I've tried sharing from the Site Settings, Direct Access, and all other sharing options, same issue.
What works: if i have three users john, bob and rick all at abc.com and i add them all to a group and share or add that group to a file or folder in sharepoint, when i send the invite, it says the email was sent, but none of them receive any notifications. If I do the same thing, but this time i share or add permissions to the folder and send the invite directly to john, bob and rick (not to the group) they all receive the email notifications. I've checked all the spam, junk and quarantine folders, nothing is being blocked or filtered.
Thanks for your help in advance.

