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Please post a screenshot of your, "Software information page", including the, "Service provider software version", details.
Settings > About phone > Software information >Service provider software version
Samsung are restricting the Beta firmware to unlocked, non-carrier branded, firmware on CSC code BTU, as per this statement...
@TAStudios Nothing to show that it is for unlocked phones except for the statement, "(unlocked version)", on Samsung's own website and shown in my previous screenshot.
Unfortunately, some people think that because they are on XYZ carrier that it is available from that carrier when in fact their CSC code is BTU.
So far, no-one has been able to provide a screenshot of the Beta firmware on anything other than BTU.
Carrier branded firmware is not included as it would take Samsung too long to add the various bloatware and receive carrier certification. Samsung restricted Beta test to their CSC code BTU for the S20 devices last year, also.