After you file
I was able to figure this out!
It appears that the issue is the M1PR property tax form. I was filing Federal, MN State, and the Property tax form all at once. What I did, was instead of choosing to E-File when the option came up, I chose the other option instead, then I was able to mark my State and Property tax forms as "file later". When I transmitted just the Federal form it worked without issue. Then I went back and just selected the MN state return (leaving the property tax form as "file later"), and that transmitted without issue as well.
Now with both the Fed and State tax forms transmitted successfully, if I try to just transmit the property tax form, it still gives the "2025 transmissions are not available" message. I am assuming MN is not actually accepting these forms yet, even though it says it is ready to e-file here https://form-status.app.intuit.com/tax-forms-availability/formsavailability?albRedirect=true&product...
