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This forum is NOT the support department of PTC.
Your post ended up on PTC's users forum, and us users cannot help you with licensing. That you ended up here is not your fault, but appears to be PTC policy, possibly to prevent them from helping their customers in the first place.
To reach PTC support try the following links:
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Luc
Article - "Mathcad Prime reports an error "(-9) Invalid host" on specific machines even though host-id in the license file matches with host-id displayed in application UI": https://www.ptc.com/en/support/article/CS314914
