Gmail account not adding to iPhone 11 Pro

Hi,

I'm wondering if anyone can help me out. I have a work Gmail that I have stored on my personal phone with only the calendar synced. it was having trouble syncing so I deleted the Gmail from my phone but when trying to re-add, it wont process. It lets me type in my email address and password however once i hit the login button it loads for a second and then just flicks back to the 'add account' page.

Any help is most appreciated

Thanks,