Welcome to the #dominoforever Product Ideas Forum! The place where you can submit product ideas and enhancement request. We encourage you to participate by voting on, commenting on, and creating new ideas. All new ideas will be evaluated by HCL Product Management & Engineering teams, and the next steps will be communicated. While not all submitted ideas will be executed upon, community feedback will play a key role in influencing which ideas are and when they will be implemented.
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Traveler does have device approval feature which gives the admin control over which devices are allowed to register. Otherwise, this particular case, the admin can deny access for this particular user and device: https://help.hcltechsw.com/traveler/11.0.0/Denying_or_allowing_access_to_a_user.html
There is at least one 3rd party product for that ( midpoints traveler.rules )