Encountering the "Horizon Connection Server license key is invalid" error can have several negative implications for your organization:
: The key must be exactly 25 characters (five segments of five digits) with no trailing spaces or hidden characters.
A single Horizon Connection Server license is typically per concurrent user or per named user , not per server. An “invalid” key can also appear if you exceed the licensed count – check usage with vdmadmin -L -licenses .