Android Alpha Tests : "The requested URL was not found on this server" or "item not found"

I published an alpha version of my game on the android play store to test it. As in this post, everything seems to be fine BUT I cannot access the alpha play store page to download the apk. I followed every solutions I can find on forums (clear cache, keep only one account on my phone, etc) but still no positives results. The alpha is in published state since 1 week.

Has anyone encountered similar delays/issues ? and if so have you found any solutions ?

Thanks