If you delete the standard-account, does the other one synch then?
If not, and if you delete the 2nd one too, then add it again, does it then synch?
Point being, if the 2nd one synchs if the 1st gets deleted, and/or if the 2nd synchs after both deleted and the 2nd re-added, then there seems to be an issue with iOS and 2 different accounts from the same 'provider' (or maybe with 2 Gmail accounts only - it might work with 2 other accounts, eg 2x Outlook or 2x Yahoo etc.). If only the 1st account ever synchs, then it is very likely that there is something wrong in settings (of the Gmail account on the internet, not on the phone).
02-04-2020 05:51 AM