Well, you're still not saying what the Teamwork server machine is, or what release number you have.
But you say you're
not
running the "Candidate" release. To me, that means that you're running the MacPPC version of Archicad, which still is the only official release of Archicad.
In fact, you're running it in Rosetta (which is the MacBook's built-in PowerPC emulator that lets it run non-Intel Mac programs), even if it doesn't tell anywhere. This is possible, but unsupported. This might be the problem. If so, try upgrading to the Mactel beta release.
AC4.1-AC26SWE; MacOS13.5.1; MP5,1+MBP16,1