Hi Tia_TK,
Thanks for using Microsoft products and posting in the community, I'm glad to offer help.
According to your description, I did the following test and it worked properly on my side, when I set the column type to 'Date and time', they were formatted correctly without any error.
In your case, would you mind re-creating a new spreadsheet to check the outcome, it would be helpful to determine whether it is a random mistake.
Besides, if the issue persists, please remove any sensitive information and upload the workbook to your personal OneDrive (not OneDrive for business) or other personal cloud storage services, then paste the sharing link here so that we can further investigate it. And please indicate at which step you encountered an error message while importing the workbook.
Looking forward to your feedback.
Best Regards,
Arck