Migration Assistant Error

I can’t seem to find anything on the internet about this error code. When I use migration assistant on the new Mac, I select the old Mac as the source and I get the error message “there was a problem connecting to the server you do not have permission to access this server” Here are the specs: Old Mac: MacBook Pro (13-inch, M1, 2020) macOS Monterey V12.5.1 (Unable to update further because of disk space) New Mac: Mac Mini M4 Pro macOS Sequoia 15.2 Both are connected via ethernet and thunderbolt. I have removed firewalls, added file sharing, restarted both macs multiple times, with no luck. I tried using Time Machine backup from an HDD and it says it’s unable to backup and that I must use migration assistant. I don't know where to go from here.