Hi @Nizar BOUAZIZI ,
Maybe this thread helps:
https://learn.microsoft.com/en-us/answers/questions/66463/wvd-inbound-ip-address-restrictions.html
With conditional access it should be possible to limit inbound connection by IP ranges.
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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten