
User1697960304343261433 (Customer) asked a question.
If user give 2 unsuccessful password attempts MFA need to trigger for this we have created work flow while executing i am getting 204 error
Error : Invalid type conversion: Cannot parse string invalid number at line 1 column 2

I think we would need to see the exact Workflow card along with inputs and outputs in order to give any suggestions. Rather than updating this post, I suggest you attend an Okta Workflows Office Hours online meetup that are held multiple times each week. This will give you an opportunity to share your screen and use case with Workflows experts who should be able to quickly tell you what is going on.
Okta Community Hours: "Live answers to builder questions from Workflows advocates in a semi-private group"
(Link bottom right) https://support.okta.com/help/s/product-hub/workflows/builder-community?language=en_US
(Link to sign up) https://calendly.com/oktaworkflows
If you don't wish to attend a Workflows Office Hours event, I again think you will need to provide more details in order for the community to respond with anything useful. It will be important to know if this a 204 HTTP code which would mean success or a E0000204 which would mean "SMS rate limit exception 429". Also knowing what Workflow action card is failing and what its exact input and output values would be a must to know.
Okta error code info: https://developer.okta.com/docs/reference/error-codes/#E0000202
Okta SMS rate limits: https://developer.okta.com/docs/reference/rl-additional-limits/#sms-and-call-rate-limits