Thanks for reaching out to to Q&A.
You can take a look at the Monitor section of the Function which would show the invocations/execution results.
Also you can run queries in App insights to get detailed logs. Click on "Run query in App insights" option in the monitor page to navigate to the below screen.
These logs would be helpful in checking the results of the functions. I hope this helps!
Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.