Hi @abdul-salam.fousseni and welcome to the community,
The place you are is indeed what @Teodora _Old Street Solutions_Tempo_ states, the page where you create new instance of jira, confluence etc. If you remove the hyphen from the middle, as the message state, and use lower case letters you'll be ok.
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Looks like you are in the process of creating a new instance. Have you tried to use lowercase and remove the hyphen as the error message advises?
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