MacOS - Cannot select exit node (exit nodes greyed out)

macOS
1

Hi, I have some machines connected to Tailscale. (I just obscured the IPs and machine names)

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My problem is that from pc4 (MacOS) I cannot select other devices as exit nodes. It used to work, I was able to select an exit node, but today I tried once again and I found this out. (Again, I hid the machine names)

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PCs and Android devices can use exit nodes without issues, so I’d say the issue is in the MacOS machine, but cannot understand what causes it.
I already tried to restart Tailscale and logout and login.
Any idea on what I can check to make it work again?

Thanks