VCF 9.x
9.1 beta EAP shows up as a 8.x beta license and used for licensing 9.1 beta.
Check Trials & Beta in the Support Portal https://support.broadcom.com/group/ecx/trials-program for Beta Licensing Keys.
Note the key may show as a legacy vSphere licensing key.
Enterprise Users can request to join available Beta Program on eligible support products.