Phishing Report Button is not deployed to all subgroups
Please follow these steps:
For Microsoft 365
Log in to your Admin Center and click on "Admin".
Click "View All" in the left sidebar and select "Services and Add-Ins" under the "Settings".
Select the SoSafe Phishing Reporting add-in.Under "Who has access", click "Edit".
Make sure that "Everyone" is selected.
If you would like to roll out the addin to specific groups only, verify that you have also assigned the subgroups to the add-in.
For Exchange 2016
Log in to your Exchange Admin Center and go to the "Organization" menu. Then open the "Add-Ins" tab.
Check the values of the SoSafe Phishing-Reporting add-In in the "Provided for" column.
If you need to edit the distribution groups for the add-in, please check the Installation manual for Exchange.