Adding a property variable in Access Token field returns invalid token.

In my usage I fetch bearer token by using HTTP or REST test steps instead of using any built in mechanism in authorization tabs.

Same here, not using builtin auth tab.

Will generate the token in the Project's Load script using groovy(using groovy-wslite). So, beginning first test case, token can be used ( no separate steps required as token already generate as soapui load's the project, to generate token again automatically, run the Project's load script)