Hi isis_2956,
Thank you for reaching out, and sorry to hear that you are experiencing an issue.
As mentioned, you used to receive an email notification when a document was signed. Could you please confirm whether you are not receiving notifications for the document you sent for signature or the document you received that requires your signature?
In the meantime, please check with the account administrator and ask them to review the Admin > Account Settings > Global Settings in Acrobat Sign. Also, check the personal and shared notifications settings. Please refer to the information here: Configure personal event/alert notifications.
Let us know how it goes.
Thanks,
Meenakshi