Did you transfer the 1065 to 2024?

Is the S-election effective for all of 2024?

Yes, the info from last year was transferred (as a 1065) but the Sub S election is effective beginning 1/1/24.  

Need a new EIN. See link.

https://www.irs.gov/businesses/small-businesses-self-employed/when-to-get-a-new-ein

Actually, a new EIN is not required when an LLC taxed as a partnership elects Subchapter S status.  It’s confusing on the IRS website, but I checked with them when the election was made and was told their EIN would not change.  
The problem is in the Proseries Professional software that recognizes the tax ID from the previous year’s 1065, since there isn’t a way to convert from 1065 to 1120S.  

Thank you!  You’re right, no need to have a 1065 listed.  I guess I shouldn’t have transferred that file!