This is an obvious indication that FiveM/Cfx.re is having issues with their client authentication service.
Live status for the client authentication service can be found here, among other essential services that FiveM/Cfx.re operates, should they have issues too.
Q: Can you fix this issue?
A: We can't solve this as we're not the developers of FiveM/Cfx.re - it's simply not our responsibility.
Q: How can I fix this?
A: You can't. No one can solve this error except for the developers of FiveM/Cfx.re - wait patiently until they do so.
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