Hello @SharePoint Support ,
The easiest way to get all the tasks assigned to the current logged-in user is to call the REST API endpoint "Search for issues using JQL" and provide the below JQL either in the request body or as a url parameter (depending on whether you use the POST or GET method):
issuetype = Task AND assignee = currentUser()
For further details on this you may want to review the REST API documentation:
Also, if you are actually build an add-on or anything similar and you will need further help in doing so, you may want to refer to the resources listed in https://developer.atlassian.com/resources.
I hope this helps.
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