Yep, just got a response from NS support confirming it's an issue. But doesn't look like it's a defect, i thin it's a new "feature"
Good day!
I coordinated your case with the internal team, I found out that your concern should be handled by a different team, which is the ERP team. However, they confirmed that your concern is part of an ongoing issue “756695 Reports > Schedule Report > Email Field Greyed out”. They greyed out the email field for security reasons, the security team has identified the possibility to edit the email address with any arbitrary email as possibly a security spam attack.
They provided an alternate solution for this concern
To send the report to outsiders, create Contact records and add them to a Group.
A. Create a Contact Record
1. Go to Lists > Relationships > Contacts > New.
2. Enter details for Name and Email Address.
3. Click Save.
Do this for other external contacts for the report.
B. Create Group
1. Go to Lists > Relationships > Groups > New.
2. You may select Dynamic if your recipients are changing. But for this example, we will use Static.
3. On "What kind of members would you like to include?", set it to Contact.
4. Click Continue.
5. Add details to Name.
6. Under Members tab > Group Members > Select the Contact record created above and click the Add button.
7. Click Save.
Sending Report Email to a Group:
1. Open the report > Click Email Icon.
2. On the Email Report pop-up form > Recipients > Copy Others.
3. Type the name of the Group you created.
Note: The email address will be blank.
4. Click Send.
Since your concern is part of an ongoing issue, we will be closing this case. We understand that this might affect your daily work, but rest assured that we will do our best to make your day-to-day tasks much easier. Thank you for understanding.
Regards,