Users trying to log Activity Reports under Privacy Mode (Incognito, InPrivate Browsing, ect.) may be unable to do so. V2 caches entries made for Reports before they're submitted because we don't want a connection failure or some other interruption to cause lost work.
Disable Private Browsing to Resolve
If users experience the inability to continue while writing reports, due to the NEXT button remaining gray despite all values being filled and selected, turning off privacy mode should resolve the problem.