Hence this works in incognito mode cause incognito mode or simple safe mode with no addons etc as offered by many popular browsers -does not retain any login credintial backend data like google accounts login cache or cookies or certificates data etc etc. This sometimes get messed up when there are multiple google accounts being used on the same desktop browser or device and google is unable to authenticate the credintials of the correct user of its google drive products due to multiple login credintials, cookies etc.

Google drive & its different drive products access is limited or granted to each users google account based on the access permissions that the user has to each google product, in this case forms is part of the google docs product category under the google drive family- you can only access your google drive folder or products or those that have been shared with you only if you are already logged in into your own google id - whether personal or gsuit does not matter - but you need to have access permission granted to the files you want to access - this is accomplished by your google login id & password. I know this is an old post but this answer is for anyone else looking for the same solution to a similar problem quite recently.

Google chrome signs me out