Hi Dale Davis,
Thank you for reaching out on the Microsoft Q&A forum.
We’ve tested the flow on our end, and it's working fine. Please refer to the screenshot below for the correct setup.
Ensure that the date input is in the European format (dd/MM/yyyy) and that the variable is correctly applied in the 'Text to convert' field. If the issue persists, kindly double-check the input values and ensure there are no inconsistencies in the variable.
If you are still facing any issue, please let us know in the comments and where you are encountering this error along with the screenshot for reference. We are glad to help you.
Please don’t forget to Accept Answer and Yes for "was this answer helpful" wherever the information provided helps you, this can be beneficial to other community members.
Thank you.