Thank you very much for your support!

We've checked to see your Pro account work normally now.
Does the feature of syncing with Google Cal work now? If still not, please check and do as follow:

Go to the Settings page on web version: https://i.doit.im/home/#/settings/account , click two buttons:
1. Click “Link to Google Cal, which is used to sync tasks in Doit.im to Google Cal;
2. Click “Modify the reverse-synced calendar lists”, and choose a calendar of Google Cal, which you may use to sync tasks from Google Cal to Doit.im.

Having finished the above settings, you may see the two sides can sync each other’s tasks. If you want to see the latest data of Google Cal in Doit.im, just click “Sync GCal”. It’s because there are quotas for Google’s sync, that is, it is unable to transmit data automatically to other apps from time to time.

If any further questions, please feel free to contact us.
Have a nice day!