When accessing the "Delivery Options" of an Exchange Online User in ARS WI Exchange Online Properties, the "Send on Behalf" setting is listed, but the Add/Remove buttons are missing, when delegated permissions via "Azure - User Full Control" Access template is applied. Also, "Forwarding address" feature appears disabled:
1.- Copy ACL "Azure - User Full Control".
2.- Paste and create a new ACL template.
3.- Include the following attributes:
- Send on behalf: ExchOIpublicDelegates
- Forwarding address: ExchOlatRecipient and ExchOIdeliverAndRedirect