I think i'm not clear, sorry.
I add my fleet server with quick start parameters.
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My first try => I put my informations : Name and https://MYIP:8220 
 Generate fleet server policy
 and install "fleet server to a centralized host"
 But when i install i see : "message":"Generating self-signed certificate for Fleet Server"
 And when i want to enroll agent into fleet : Error: fail to enroll: fail to execute request to fleet-server: x509: certificate signed by unknown authority
 For help, please see our troubleshooting guide at Troubleshoot common problems | Fleet and Elastic Agent Guide [8.6] | Elastic
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Second try => So after i create my own certificates and run the command i show you before to install my fleet server. 
 But when i try to enroll a new Agent in Fleet with my own certificates, the error is the same.
I don't know where is my mistake.