HI @LukaszChomin-9207,
Did you follow the step-by-step documentation offered by Microsoft over here?
How to publish the Remote Desktop web client
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/remote-desktop-web-client-admin#how-to-publish-the-remote-desktop-web-client
How to update the Remote Desktop web client
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/remote-desktop-web-client-admin#how-to-update-the-remote-desktop-web-client
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(If the reply was helpful please don't forget to upvote or accept as answer, thank you)
Best regards,
Leon