@Bartolo Riccobono , Error 204 is a generic one and can occur due to several reasons. Here is a similar request for a quick reference. Please do refer to the troubleshooting tips mentioned and do let us know if you are still unable to avoid this error.
Connecting with a Mac using rdp, very often we experiment error 204, in some way the rdp file te degraded.
Bartolo Riccobono
1
Reputation point
Connecting with a Mac with update system to a virtual machine on Azure, with 2019 server, using rdp, very often we experiment error 204, in some way the rdp file te degraded.
For some time tyhe copnnection is ok, but closing the virtual machine (in the correct way), next time I try to connect to the virtual machine with the Mac I cannot connect, witt 204 error.