I’d look at VO2Max on the watch for entertainment value and move on.

the watch is only going to spit out vo2max estimates for >20 minute outdoor walks/runs/hikes that meet the eligibility requirements it wants (namely, relatively flat elevation during those activities), so i'm not sure how relevant any estimates you're getting are going to be if you're not doing a lot of those activities.

the watch is, of course, incapable of giving you an actual vo2max measurement anyway, since it can't measure oxygen consumption. and even properly measured in a lab with an oxygen mask, it's not a particularly useful performance metric.