Hello @faBius marKion ,
1.Is it working for MacOS but not working for iPhone?
2.What's the exact error message?
3.What's the version of your RD client? Can you reinstall the RD Client and check if the issue still occurs?
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/remote-desktop-ios
4.What about using the beta version? https://install.appcenter.ms/orgs/rdmacios-k2vy/apps/microsoft-remote-desktop-for-mac/distribution_groups/all-users-of-microsoft-remote-desktop-for-mac
5.Please also check the following post to see it it helps: https://learn.microsoft.com/en-us/answers/questions/387794/rdp-stopped-working-34unable-to-connect34-0x204-er.html
Best regards,
Leila
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