could not able to configure timer Event for Monthly, getting Error as process Invalid.
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I just tested this scenario and got a similar behaviour. To solve it, I changed the two fields after the "The" to a different value, clicked OK, and then changed them back to "1st" and "Sunday".
Ensure the time format is correctly set (00:01 AM might need to be just 00:01 in 24-hour format, depending on Appian's input requirements).
Thanks Stefan Helzle it worked.
Interesting behavior of the env .