A workflow can look correct while producing a result you cannot find. Before rebuilding it, check where the output was sent and which account is connected.
Check the account first
When you use more than one email address or calendar, the destination matters. Confirm the account shown in the tool and open the result in that same account.
Follow one item from start to finish
Use an example you can recognise. Check the input, each decision, the destination and the final result. Do not stop at a message saying the workflow ran successfully.
Test timing and repetition
For scheduled work, check the local time zone, the first occurrence, the next occurrence and the end date. Confirm that notifications are enabled where you expect to receive them.
Try a failure case
What happens if an email address is missing, a record appears twice or a service is unavailable? The workflow should make a problem visible instead of silently skipping important work.
Keep a simple review record
Write down the test date, input, expected result and actual result. Include who checked it. Repeat the relevant checks after changing a connection, prompt, schedule or business rule.
My electricity-bill reminder video is one example of putting scheduling into a practical business routine. The connected account and the result both need checking.