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spacedesk automatically configures the Windows Firewall to allow spacedeskService during installation, you can verify it via Control Panel\System and Security\Windows Defender Firewall\Allowed apps.
Maybe you can also try to manually create an Inbound/Outbound rules in the Firewall settings for spacedeskService.
spacedesk uses TCP port 28252.
By the way, what is the current network profile on your primary machine? Public or Private?
Are both WiFi network on primary machine and cellphone have the same network band/frequency (e.g. 2.4GHz or 5Ghz)?