Vo2 max estimate not updating

Hello everyone,

I bought this watch a few weeks ago now and I only have one reading for my VO2max (on the 24th of may). I have been running almost daily since and have several times met the criteria for new updates on my VO2 but it does not appear on the graph (todays run for example : Over 160 bpm for 20 minutes with gps tracker on). I have put in all the required data such as max HR, weight, height, age... you name it, I have set it up.
I just don't know what to do anymore to try to resolve this issue. Any help is welcome.

Thank you in advance