Distribution List permission issues specified sender

Bühler Gabriel
46
Reputation points
Hello Everyone
We are currently using a distribution list where only a few specified users are allowed to send E-Mails to ("specified senders permissions"). Now recently two of these users reported that they are not able to send E-Mails to this distributionlist anymore, though they are still able to send calendar invites where this distribution list is included as a member
- The users have the permissions necessary (visible over powershell as well)
- They are not able to send emails to that list over Outlook and in Browser
- I proactively removed and readded the permissions in question and tried again
Do you may know what else we could try?
Thank you for your help.
Kind regards,
Gabriel