How to allocate checklist for more than 1000 employees and trigger notification at the same time ?

Summary:

How to allocate checklist for more than 1000 employees and trigger notification at the same time ?

Content (please ensure you mask any confidential information):

Since HDL load does not send notifications, we are looking for alternate approach to assign checklist for 1000 employees and trigger notification at the same time ? Please advise

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):